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221 vulnerabilities by discourse
CVE-2026-28227 (GCVE-0-2026-28227)
Vulnerability from cvelistv5 – Published: 2026-02-26 21:27 – Updated: 2026-03-03 14:44
VLAI?
Title
Discourse Vulnerable to Unauthorized Topic Creation in Staff-Only Categories via Topic Timer publish_to_category
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users can publish topics into staff-only categories via the `publish_to_category` topic timer, bypassing authorization checks. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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}
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CVE-2026-28219 (GCVE-0-2026-28219)
Vulnerability from cvelistv5 – Published: 2026-02-26 21:25 – Updated: 2026-03-03 15:08
VLAI?
Title
Privilege Escalation via Mass Assignment Allows Regular Users to Set Topics as Global Banners
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an improper authorization check in the topic management logic allows authenticated users to modify privileged attributes of their topics. By manipulating specific parameters in a PUT or POST request, a regular user can elevate a topic’s status to a site-wide notice or banner, bypassing intended administrative restrictions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. There are no practical workarounds to prevent this behavior other than applying the security patch. Administrators concerned about unauthorized promotions should audit recent changes to site banners and global notices until the fix is deployed.
Severity ?
CWE
- CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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}
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CVE-2026-28218 (GCVE-0-2026-28218)
Vulnerability from cvelistv5 – Published: 2026-02-26 21:23 – Updated: 2026-03-02 21:10
VLAI?
Title
Discourse's Fail-Open Access Control in Data Explorer Plugin Allows Unauthorized SQL Query Execution
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, fail-open access control in Data Explorer plugin allows any authenticated user to execute SQL queries that have no explicit group assignments, including built-in system queries. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. As a workaround, either explicitly set group permissions on each Data Explorer query that doesn't have permissions, or disable discourse-data-explorer plugin.
Severity ?
CWE
- CWE-284 - Improper Access Control
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-27154 (GCVE-0-2026-27154)
Vulnerability from cvelistv5 – Published: 2026-02-26 21:20 – Updated: 2026-03-02 20:57
VLAI?
Title
Discourse has XSS when editing a malicious post
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, a user full name can be evaluated as raw HTML when the following settings are set: `display_name_on_posts` => true; and `prioritize_username_in_ux` => false. Editing a post of a malicious user would trigger an XSS. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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}
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CVE-2026-27153 (GCVE-0-2026-27153)
Vulnerability from cvelistv5 – Published: 2026-02-26 21:16 – Updated: 2026-03-02 20:56
VLAI?
Title
Discourse doesn't prevent moderators from exporting user Chat DMs
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, moderators could export user Chat DMs via the CSV export endpoint by exploiting an overly permissive allowlist in `can_export_entity?`. The method allowed moderators to export any entity not explicitly blocked instead of restricting to an explicit allowlist. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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},
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"version": "\u003e= 2026.2.0-latest, \u003c 2026.2.0"
}
]
}
],
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}
],
"metrics": [
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"privilegesRequired": "LOW",
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"subConfidentialityImpact": "NONE",
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"discovery": "UNKNOWN"
},
"title": "Discourse doesn\u0027t prevent moderators from exporting user Chat DMs"
}
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CVE-2026-27152 (GCVE-0-2026-27152)
Vulnerability from cvelistv5 – Published: 2026-02-26 20:00 – Updated: 2026-03-03 01:41
VLAI?
Title
DIscourse has DM communication-preference bypass when adding members
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, DM communication-preference bypass when adding members via `Chat::AddUsersToChannel` — a user could add targets who have blocked/ignored/muted them to an existing DM channel, bypassing per-recipient PM restrictions that are enforced during DM channel creation. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-284 - Improper Access Control
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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}
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CVE-2026-27162 (GCVE-0-2026-27162)
Vulnerability from cvelistv5 – Published: 2026-02-26 19:58 – Updated: 2026-03-03 01:41
VLAI?
Title
DIscourse doesn't prevent whispers to leak in excerpts
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, `posts_nearby` was checking topic access but then returning all posts regardless of type, including whispers that should only be visible to whisperers. Use `Post.secured(guardian)` to properly filter post types based on user permissions. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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],
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CVE-2026-27151 (GCVE-0-2026-27151)
Vulnerability from cvelistv5 – Published: 2026-02-26 19:57 – Updated: 2026-03-03 01:42
VLAI?
Title
Discourse doesn't validate destination topic when moving posts
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the `move_posts` action only checked `can_move_posts?` on the source topic but never validated write permissions on the destination topic. This allowed TL4 users and category group moderators to move posts into topics in categories where they lack posting privileges (e.g., read-only categories or categories with group-restricted write access). Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-862 - Missing Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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},
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}
],
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}
],
"metrics": [
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],
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CVE-2026-27150 (GCVE-0-2026-27150)
Vulnerability from cvelistv5 – Published: 2026-02-26 19:55 – Updated: 2026-03-03 01:43
VLAI?
Title
Discourse doesn't ensure guardian check when creating QueryGroupBookmark
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, missing `validate_before_create` authorization in Data Explorer's `QueryGroupBookmarkable` allows any logged-in user to create bookmarks for query groups they don't have access to, enabling metadata disclosure via bookmark reminder notifications. Versions 2025.12.2, 2026.1.1, and 2026.2.0 fix this issue and also make sure `validate_before_create` throws NotImplementedError in BaseBookmarkable if not implemented, to prevent similar issues in the future. No known workarounds are available.
Severity ?
CWE
- CWE-862 - Missing Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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{
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{
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},
{
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}
],
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"timestamp": "2026-03-03T01:43:16.995941Z",
"version": "2.0.3"
},
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}
}
],
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"vendor": "discourse",
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},
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},
{
"status": "affected",
"version": "\u003e= 2026.2.0-latest, \u003c 2026.2.0"
}
]
}
],
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{
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}
],
"metrics": [
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"baseSeverity": "LOW",
"privilegesRequired": "LOW",
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"subConfidentialityImpact": "NONE",
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"userInteraction": "NONE",
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}
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},
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CVE-2026-27149 (GCVE-0-2026-27149)
Vulnerability from cvelistv5 – Published: 2026-02-26 19:52 – Updated: 2026-03-03 01:44
VLAI?
Title
Discourse has SQL injection in PM tag filtering
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, SQL injection in PM tag filtering (`list_private_messages_tag`) allows bypassing tag filter conditions, potentially disclosing unauthorized private message metadata. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-89 - Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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{
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{
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"id": "CVE-2026-27149",
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{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-03T01:43:58.112289Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
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}
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"vendor": "discourse",
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{
"status": "affected",
"version": "\u003c 2025.12.2"
},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.1"
},
{
"status": "affected",
"version": "\u003e= 2026.2.0-latest, \u003c 2026.2.0"
}
]
}
],
"descriptions": [
{
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}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"privilegesRequired": "LOW",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-89",
"description": "CWE-89: Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
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CVE-2026-27021 (GCVE-0-2026-27021)
Vulnerability from cvelistv5 – Published: 2026-02-26 19:50 – Updated: 2026-02-28 03:25
VLAI?
Title
Discourse: Poll voters endpoint lacked post visibility checks
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, the voters endpoint in the poll plugin lacked post visibility checks which allowed unauthorized access to voters details of polls in any post. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-862 - Missing Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-26979 (GCVE-0-2026-26979)
Vulnerability from cvelistv5 – Published: 2026-02-26 19:25 – Updated: 2026-02-26 20:38
VLAI?
Title
Discourse: TL4 users are able to change status of restricted topics
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, TL4 users are able to close, archive and pin topics in private categories they don't have access to. Versions 2025.12.2, 2026.1.1, and 2026.2.0 patch the issue. No known workarounds are available.
Severity ?
CWE
- CWE-862 - Missing Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-26973 (GCVE-0-2026-26973)
Vulnerability from cvelistv5 – Published: 2026-02-26 19:19 – Updated: 2026-02-26 20:41
VLAI?
Title
Discourse doesn't scope reviewable notes to user-visible reviewables
Summary
Discourse is an open source discussion platform. Versions prior to 2025.12.2, 2026.1.1, and 2026.2.0 have an IDOR (Insecure Direct Object Reference) in `ReviewableNotesController`. When `enable_category_group_moderation` is enabled, a user belonging to a category moderation group can create or delete their own notes on **any** reviewable in the system, including reviewables in categories they do not moderate. The controller used an unscoped `Reviewable.find` and the `ensure_can_see` guard only checked whether the user could access the review queue in general, not whether they could access the specific reviewable. Only instances with `enable_category_group_moderation` enabled are affected. Staff users (admins/moderators) are not impacted as they already have access to all reviewables. The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by scoping the reviewable lookup through `Reviewable.viewable_by(current_user)`. As a workaround, disable the `enable_category_group_moderation` site setting. This removes the attack surface as only staff users will have access to the review queue.
Severity ?
4.3 (Medium)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-26265 (GCVE-0-2026-26265)
Vulnerability from cvelistv5 – Published: 2026-02-26 15:10 – Updated: 2026-02-27 16:17
VLAI?
Title
Discourse has IDOR vulnerability in the directory items endpoint
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, an IDOR vulnerability in the directory items endpoint allows any user, including anonymous users, to retrieve private user field values for all users in the directory. The `user_field_ids` parameter in `DirectoryItemsController#index` accepts arbitrary user field IDs without authorization checks, bypassing the visibility restrictions (`show_on_profile` / `show_on_user_card`) that are enforced elsewhere (e.g., `UserCardSerializer` via `Guardian#allowed_user_field_ids`). An attacker can request `GET /directory_items.json?period=all&user_field_ids=<id>` with any private field ID and receive that field's value for every user in the directory response. This enables bulk exfiltration of private user data such as phone numbers, addresses, or other sensitive custom fields that admins have explicitly configured as non-public. The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by filtering `user_field_ids` against `UserField.public_fields` for non-staff users before building the custom field map. As a workaround, site administrators can remove sensitive data from private user fields, or disable the user directory via the `enable_user_directory` site setting.
Severity ?
7.5 (High)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-26207 (GCVE-0-2026-26207)
Vulnerability from cvelistv5 – Published: 2026-02-26 15:04 – Updated: 2026-02-26 21:33
VLAI?
Title
DIscourse's discourse-policy plugin lacks post access check
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, `discourse-policy` plugin allows any authenticated user to interact with policies on posts they do not have permission to view. The `PolicyController` loads posts by ID without verifying the current user's access, enabling policy group members to accept/unaccept policies on posts in private categories or PMs they cannot see and any authenticated user to enumerate which post IDs have policies attached via differentiated error responses (information disclosure). The issue is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0 by adding a `guardian.can_see?(@post)` check in the `set_post` before_action, ensuring post visibility is verified before any policy action is processed. As a workaround, disabling the discourse-policy plugin (`policy_enabled = false`) eliminates the vulnerability. There is no other workaround without upgrading.
Severity ?
5.4 (Medium)
CWE
- CWE-862 - Missing Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-26078 (GCVE-0-2026-26078)
Vulnerability from cvelistv5 – Published: 2026-02-26 15:00 – Updated: 2026-02-27 16:17
VLAI?
Title
Discourse has authentication bypass vulnerability in the Patreon plugin webhook endpoint
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, when the `patreon_webhook_secret` site setting is blank, an attacker can forge valid webhook signatures by computing an HMAC-MD5 with an empty string as the key. Since the request body is known to the sender, the attacker can produce a matching signature and send arbitrary webhook payloads. This allows unauthorized creation, modification, or deletion of Patreon pledge data and triggering patron-to-group synchronization. This vulnerability is patched in versions 2025.12.2, 2026.1.1, and 2026.2.0. The fix rejects webhook requests when the webhook secret is not configured, preventing signature forgery with an empty key. As a workaround, configure the `patreon_webhook_secret` site setting with a strong, non-empty secret value. When the secret is non-empty, an attacker cannot forge valid signatures without knowing the secret.
Severity ?
7.5 (High)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-26077 (GCVE-0-2026-26077)
Vulnerability from cvelistv5 – Published: 2026-02-26 14:58 – Updated: 2026-02-27 16:19
VLAI?
Title
Discourse doesn't ensure webhooks require a token
Summary
Discourse is an open source discussion platform. Prior to versions 2025.12.2, 2026.1.1, and 2026.2.0, several webhook endpoints (SendGrid, Mailjet, Mandrill, Postmark, SparkPost) in the `WebhooksController` accepted requests without a valid authentication token when no token was configured. This allowed unauthenticated attackers to forge webhook payloads and artificially inflate user bounce scores, potentially causing legitimate user emails to be disabled. The Mailpace endpoint had no token validation at all. Starting in versions 2025.12.2, 2026.1.1, and 2026.2.0, all webhook endpoints reject requests with a 406 response when no authentication token is configured. As a workaround, ensure that webhook authentication tokens are configured for all email provider integrations in site settings (e.g., `sendgrid_verification_key`, `mailjet_webhook_token`, `postmark_webhook_token`, `sparkpost_webhook_token`). There's no current workaround for mailpace before getting this fix.
Severity ?
6.5 (Medium)
CWE
- CWE-287 - Improper Authentication
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-24742 (GCVE-0-2026-24742)
Vulnerability from cvelistv5 – Published: 2026-01-28 20:11 – Updated: 2026-01-28 20:35
VLAI?
Title
Discourse staff action logs expose sensitive information to moderators
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators can view sensitive information in staff action logs that should be restricted to administrators only. The exposed information includes webhook payload URLs and secrets, API key details, site setting changes, private message content, restricted category names and structures, and private chat channel titles. This allows moderators to bypass intended access controls and extract confidential data by monitoring the staff action logs. With leaked webhook secrets, an attacker could potentially spoof webhook events to integrated services. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, site administrators should review and limit moderator appointments to fully trusted users. There is no configuration-based workaround to prevent this access.
Severity ?
6.5 (Medium)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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CVE-2026-23743 (GCVE-0-2026-23743)
Vulnerability from cvelistv5 – Published: 2026-01-28 20:07 – Updated: 2026-01-28 21:07
VLAI?
Title
Discourse allows permalinks to restricted resources to leak resource slugs to unauthorized users
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, permalinks pointing to access-restricted resources (private topics, categories, posts, or hidden tags) were redirecting users to URLs containing the resource slug, even when the user didn't have access to view the resource. This leaked potentially sensitive information (e.g., private topic titles) via the redirect Location header and the 404 page's search box. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
Severity ?
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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}
CVE-2026-21865 (GCVE-0-2026-21865)
Vulnerability from cvelistv5 – Published: 2026-01-28 19:51 – Updated: 2026-01-28 20:10
VLAI?
Title
Discourse topic conversion permission vulnerability for moderators
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can convert some personal messages to public topics when they shouldn't have access. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, site admin can temporarily revoke the moderation role from untrusted moderators or remove the moderator group from the "personal message enabled groups" site setting until the Discourse instance has been upgraded to a version that has been patched.
Severity ?
6.5 (Medium)
CWE
- CWE-862 - Missing Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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CVE-2025-69289 (GCVE-0-2025-69289)
Vulnerability from cvelistv5 – Published: 2026-01-28 19:33 – Updated: 2026-01-28 20:15
VLAI?
Title
Discourse has insecure default configuration that allows non-admin moderators to takeover any non-staff account via email change
Summary
Discourse is an open source discussion platform. A privilege escalation vulnerability in versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 allows a non-admin moderator to bypass email-change restrictions, allowing a takeover of non-staff accounts. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, ensure moderators are trusted or enable the "require_change_email_confirmation" setting.
Severity ?
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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CVE-2025-69218 (GCVE-0-2025-69218)
Vulnerability from cvelistv5 – Published: 2026-01-28 19:30 – Updated: 2026-01-28 19:45
VLAI?
Title
Discourse moderators can access admin-only reports exposing private upload URLs
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, moderators can access the `top_uploads` admin report which should be restricted to admins only. This report displays direct URLs to all uploaded files on the site, including sensitive content such as user data exports, admin backups, and other private attachments that moderators should not have access to. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. There is no workaround. Limit moderator privileges to trusted users until the patch is applied.
Severity ?
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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},
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},
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}
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}
],
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CVE-2025-68934 (GCVE-0-2025-68934)
Vulnerability from cvelistv5 – Published: 2026-01-28 19:19 – Updated: 2026-01-28 19:46
VLAI?
Title
Discourse Has Denial of Service (DoS) Vulnerability in Drafts Creation Endpoint
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, authenticated users can submit crafted payloads to /drafts.json that cause O(n^2) processing in Base62.decode, tying up workers for 35-60 seconds per request. This affects all users as the shared worker pool becomes exhausted. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. Lowering the max_draft_length site setting reduces attack surface but does not fully mitigate the issue, as payloads under the limit can still trigger the slow code path.
Severity ?
6.5 (Medium)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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],
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},
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},
{
"status": "affected",
"version": "\u003e= 2025.12.0-latest, 2025.12.1"
},
{
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"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.0"
}
]
}
],
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}
],
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CVE-2025-68933 (GCVE-0-2025-68933)
Vulnerability from cvelistv5 – Published: 2026-01-28 19:17 – Updated: 2026-01-28 20:16
VLAI?
Title
Discourse non-admin moderators can exfiltrate private content via post ownership transfer
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators with the `moderators_change_post_ownership` setting enabled can change ownership of posts in private messages and restricted categories they cannot access, then export their data to view the content. This is a broken access control vulnerability affecting sites that grant moderators post ownership transfer permissions. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. The patch adds visibility checks for both the topic and posts before allowing ownership transfer. As a workaround, disable the `moderators_change_post_ownership` site setting to prevent non-admin moderators from using the post ownership transfer feature.
Severity ?
6.9 (Medium)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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{
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{
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},
{
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}
],
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"timestamp": "2026-01-28T20:15:21.675325Z",
"version": "2.0.3"
},
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}
}
],
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},
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}
],
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{
"product": "discourse",
"vendor": "discourse",
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{
"status": "affected",
"version": "\u003c 3.5.4"
},
{
"status": "affected",
"version": "\u003e= 2025.11.0-latest, \u003c 2025.11.2"
},
{
"status": "affected",
"version": "\u003e= 2025.12.0-latest, \u003c 2025.12.1"
},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.0"
}
]
}
],
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{
"lang": "en",
"value": "Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, non-admin moderators with the `moderators_change_post_ownership` setting enabled can change ownership of posts in private messages and restricted categories they cannot access, then export their data to view the content. This is a broken access control vulnerability affecting sites that grant moderators post ownership transfer permissions. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. The patch adds visibility checks for both the topic and posts before allowing ownership transfer. As a workaround, disable the `moderators_change_post_ownership` site setting to prevent non-admin moderators from using the post ownership transfer feature."
}
],
"metrics": [
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"cvssV3_1": {
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "HIGH",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:H/A:N",
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}
],
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},
"title": "Discourse non-admin moderators can exfiltrate private content via post ownership transfer"
}
},
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CVE-2025-68666 (GCVE-0-2025-68666)
Vulnerability from cvelistv5 – Published: 2026-01-28 19:14 – Updated: 2026-02-26 14:58
VLAI?
Title
Discourse users archives leaked to users with moderation privileges
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, users archives are viewable by users with moderation privileges even though moderators should not have access to the archives. Private topic/post content made by the users are leaked through the archives leading to a breach of confidentiality. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. To work around this problem, a site admin can temporarily revoke the moderation role from all moderators until the Discourse instance has been upgraded to a version that has been patched.
Severity ?
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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}
],
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CVE-2025-68662 (GCVE-0-2025-68662)
Vulnerability from cvelistv5 – Published: 2026-01-28 19:12 – Updated: 2026-01-28 20:21
VLAI?
Title
FinalDestination hostname matching allows SSRF protection bypass
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, a hostname validation issue in FinalDestination could allow bypassing SSRF protections under certain conditions. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
Severity ?
7.6 (High)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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}
],
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"version": "2.0.3"
},
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}
}
],
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],
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},
{
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},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.0"
}
]
}
],
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{
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}
],
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}
}
],
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{
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}
]
}
],
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"x_refsource_CONFIRM"
],
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}
],
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},
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}
},
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CVE-2025-68660 (GCVE-0-2025-68660)
Vulnerability from cvelistv5 – Published: 2026-01-28 18:55 – Updated: 2026-01-28 19:27
VLAI?
Title
Discourse AI Discover's continue conversation allows threat actor to impersonate user
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, an endpoint lets any authenticated user bypass the ai_discover_persona access controls and gain ongoing DM access to personas that may be wired to staff-only categories, RAG document sets, or automated tooling, enabling unauthorized data disclosure. Because the controller also accepts arbitrary user_id, an attacker can impersonate other accounts to trigger unwanted AI conversations on their behalf, generating confusing or abusive PM traffic. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
Severity ?
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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{
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],
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},
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}
],
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},
{
"status": "affected",
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},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.0"
}
]
}
],
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"lang": "en",
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}
],
"metrics": [
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"attackVector": "NETWORK",
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"x_refsource_CONFIRM"
],
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}
],
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},
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}
},
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},
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}
CVE-2025-68659 (GCVE-0-2025-68659)
Vulnerability from cvelistv5 – Published: 2026-01-28 18:51 – Updated: 2026-01-28 20:20
VLAI?
Title
Discourse has DoS vulnerability in username change endpoint
Summary
Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have an application level denial of service vulnerabilityin the username change functionality at try.discourse.org. The vulnerability allows attackers to cause noticeable server delays and resource exhaustion by sending large JSON payloads to the username preference endpoint PUT /u//preferences/username, resulting in degraded performance for other users and endpoints. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
Severity ?
4.3 (Medium)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
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{
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},
{
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}
],
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"timestamp": "2026-01-28T20:20:14.148307Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
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},
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}
],
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"vendor": "discourse",
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{
"status": "affected",
"version": "\u003c 3.5.4"
},
{
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"version": "\u003e= 2025.11.0-latest, \u003c 2025.11.2"
},
{
"status": "affected",
"version": "\u003e= 2025.12.0-latest, \u003c 2025.12.1"
},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.0"
}
]
}
],
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{
"lang": "en",
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}
],
"metrics": [
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"baseSeverity": "MEDIUM",
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}
}
],
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}
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}
],
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},
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],
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}
],
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},
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}
},
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}
CVE-2025-68479 (GCVE-0-2025-68479)
Vulnerability from cvelistv5 – Published: 2026-01-28 18:34 – Updated: 2026-01-29 18:11
VLAI?
Title
Discourse subscriptions are susceptible to takeover
Summary
Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, some subscription endpoints lack proper checking for ownership before making changes. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available.
Severity ?
7.1 (High)
CWE
- CWE-862 - Missing Authorization
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2025-68479",
"options": [
{
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},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-01-29T16:04:12.315838Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-01-29T18:11:42.379Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "discourse",
"vendor": "discourse",
"versions": [
{
"status": "affected",
"version": "\u003c 3.5.4"
},
{
"status": "affected",
"version": "\u003e= 2025.11.0-latest, \u003c 2025.11.2"
},
{
"status": "affected",
"version": "\u003e= 2025.12.0-latest, \u003c 2025.12.1"
},
{
"status": "affected",
"version": "\u003e= 2026.1.0-latest, \u003c 2026.1.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Discourse is an open source discussion platform. In versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0, some subscription endpoints lack proper checking for ownership before making changes. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. No known workarounds are available."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
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CVE-2025-67723 (GCVE-0-2025-67723)
Vulnerability from cvelistv5 – Published: 2026-01-28 18:21 – Updated: 2026-01-28 19:28
VLAI?
Title
Discourse vulnerable to stored Cross-site Scripting via Katex in discourse-math plugin
Summary
Discourse is an open source discussion platform. Versions prior to 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0 have a content-security-policy-mitigated cross-site scriptinv vulnerability on the Discourse Math plugin when using its KaTeX variant. This issue is patched in versions 3.5.4, 2025.11.2, 2025.12.1, and 2026.1.0. As a workaround, the Discourse Math plugin can be disabled, or the Mathjax provider can be used instead of KaTeX.
Severity ?
4.6 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
| URL | Tags | ||||
|---|---|---|---|---|---|
|
|||||
Impacted products
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