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452 vulnerabilities
CVE-2026-6541 (GCVE-0-2026-6541)
Vulnerability from cvelistv5 – Published: 2026-07-13 10:53 – Updated: 2026-07-13 13:09
VLAI
EPSS
VEX
Title
Unscoped updates to other playbooks' metric configuration
Summary
Mattermost versions 11.7.x <= 11.7.1, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict metric configuration changes to the playbook being saved, which allows an authenticated user with team access to alter another user’s playbook metric settings via a crafted import or update request with a foreign metric ID. Mattermost Advisory ID: MMSA-2026-00653
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.1
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.2 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-9820 (GCVE-0-2026-9820)
Vulnerability from cvelistv5 – Published: 2026-07-13 10:51 – Updated: 2026-07-13 13:09
VLAI
EPSS
VEX
Title
Mattermost schemes teams endpoint exposes private team invite IDs
Summary
Mattermost versions 11.7.x <= 11.7.2, 10.11.x <= 10.11.19 fail to sanitize team objects returned by the scheme teams endpoint, which allows a user with the User Manager role to obtain invite links for private teams and use them to join or share access to those teams via the scheme teams API endpoint.. Mattermost Advisory ID: MMSA-2026-00671
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 10.11.20 |
Credits
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CVE-2026-9824 (GCVE-0-2026-9824)
Vulnerability from cvelistv5 – Published: 2026-07-13 10:47 – Updated: 2026-07-13 13:10
VLAI
EPSS
VEX
Title
Remote cluster metadata enumeration via /share-channel autocomplete
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-9597 (GCVE-0-2026-9597)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:17 – Updated: 2026-07-13 13:55
VLAI
EPSS
VEX
Title
Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-305 - – Authentication Bypass by Primary Weakness
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 |
Credits
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CVE-2026-6850 (GCVE-0-2026-6850)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:13 – Updated: 2026-07-13 13:56
VLAI
EPSS
VEX
Title
Crafted message attachment causes client-side denial of service via markdown parser regex backtracking in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-10106 (GCVE-0-2026-10106)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:09 – Updated: 2026-07-13 13:56
VLAI
EPSS
VEX
Title
Unauthorized users can trigger interactive post actions in private channels via action cookie channel mismatch in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify that the channel referenced in an action cookie matches the channel of the target post, which allows an authenticated user without access to a private channel to trigger interactive post actions on posts in that channel via a cookie obtained from any accessible channel.. Mattermost Advisory ID: MMSA-2026-00690
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-10085 (GCVE-0-2026-10085)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:05 – Updated: 2026-07-13 13:57
VLAI
EPSS
VEX
Title
Ordinary group/direct message member can enable group_constrained and remove all channel participants
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict the group_constrained channel flag to public and private channels that support group synchronization, which allows an ordinary group or direct message member to remove all participants from the conversation via the channel patch API.. Mattermost Advisory ID: MMSA-2026-00688
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
Credits
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CVE-2026-9708 (GCVE-0-2026-9708)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:00 – Updated: 2026-07-13 14:45
VLAI
EPSS
VEX
Title
Incoming webhook user attribution via unvalidated webhook owner
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate that an assigned incoming webhook user has access to the target team or channel, which allows a requester with webhook management permissions to create posts or direct messages attributed to another user via crafted incoming webhook configuration and payloads.. Mattermost Advisory ID: MMSA-2026-00683
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
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Credits
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CVE-2026-10103 (GCVE-0-2026-10103)
Vulnerability from cvelistv5 – Published: 2026-07-13 07:57 – Updated: 2026-07-14 14:32
VLAI
EPSS
VEX
Title
Authenticated remote cluster can modify or delete posts it does not own in Mattermost Connected Workspaces shared channels
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to verify post ownership in the shared channel inbound sync handler, which allows an authenticated remote cluster to modify or delete posts authored by local users or other remotes via crafted sync messages referencing arbitrary post IDs in channels shared with that remote.. Mattermost Advisory ID: MMSA-2026-00689
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
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CVE-2026-9571 (GCVE-0-2026-9571)
Vulnerability from cvelistv5 – Published: 2026-07-13 07:50 – Updated: 2026-07-14 14:32
VLAI
EPSS
VEX
Title
Deactivated user accounts can continue to obtain valid OAuth access tokens via refresh token grant in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to invalidate OAuth refresh tokens upon user account deactivation, which allows a deactivated user or an attacker in possession of a valid refresh token to obtain new functional access tokens via the OAuth refresh token grant endpoint.. Mattermost Advisory ID: MMSA-2026-00680
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-305 - – Authentication Bypass by Primary Weakness
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
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CVE-2026-4339 (GCVE-0-2026-4339)
Vulnerability from cvelistv5 – Published: 2026-06-26 14:44 – Updated: 2026-06-26 15:40
VLAI
EPSS
VEX
Title
SSRF via unvalidated attachment URLs in Mattermost Agents plugin MCP server
Summary
Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to validate attachment URLs against internal or private IP ranges in the Mattermost Agents plugin MCP server which allows an attacker with access to the MCP server in stdio mode to perform server-side request forgery (SSRF) and exfiltrate data from internal network services via supplying internal URLs as file attachments in post creation requests.. Mattermost Advisory ID: MMSA-2026-00635
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
10.11.0 , ≤ 10.11.18
(semver)
Affected: 11.6.0 , ≤ 11.6.3 (semver) Affected: 11.5.0 , ≤ 11.5.6 (semver) Unaffected: 11.7.0 Unaffected: 10.11.19 Unaffected: 11.6.4 Unaffected: 11.5.7 |
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CVE-2026-9699 (GCVE-0-2026-9699)
Vulnerability from cvelistv5 – Published: 2026-06-26 14:43 – Updated: 2026-06-26 15:40
VLAI
EPSS
VEX
Title
Mattermost Agents plugin logs unsanitized OpenAI API keys on authentication errors
Summary
Mattermost Plugins versions <=11.6 10.18.11 11.3.6 11.6.5.0 fail to sanitize error responses from the OpenAI API before logging, which allows a user with access to server logs or support packets to obtain a valid or partially reconstructable OpenAI API key via inspection of mattermost.log entries generated during authentication failures. Mattermost Advisory ID: MMSA-2026-00609
Severity
6.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-532 - Insertion of Sensitive Information into Log Files
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
0 , ≤ 10.18.11
(semver)
Affected: 0 , ≤ 11.3.6 (semver) Affected: 0 , ≤ 11.6.5 (semver) Unaffected: 11.7.0 Unaffected: 10.11.19 Unaffected: 11.6.4 Unaffected: 11.5.7 |
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CVE-2026-3472 (GCVE-0-2026-3472)
Vulnerability from cvelistv5 – Published: 2026-06-26 14:42 – Updated: 2026-06-26 15:41
VLAI
EPSS
VEX
Title
Markdown image rendering bypass in AI bot tool result posts in Mattermost
Summary
Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result posts, which allows an authenticated attacker to exfiltrate data to an attacker-controlled server via injecting markdown image syntax into tool result content rendered by a victim's client.. Mattermost Advisory ID: MMSA-2026-00619
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-693 - Protection Mechanism Failure
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
10.11.0 , ≤ 10.11.18
(semver)
Affected: 11.6.0 , ≤ 11.6.3 (semver) Affected: 11.5.0 , ≤ 11.5.6 (semver) Unaffected: 11.7.0 Unaffected: 10.11.19 Unaffected: 11.6.4 Unaffected: 11.5.7 |
Credits
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CVE-2026-13426 (GCVE-0-2026-13426)
Vulnerability from cvelistv5 – Published: 2026-06-26 13:47 – Updated: 2026-06-26 14:39
VLAI
EPSS
VEX
Title
Client4 fails to validate path parameters
Summary
The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost Advisory ID: MMSA-2025-00532
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | github.com/mattermost/mattermost/server/public |
Affected:
v0.0.0 , < v0.1.22
(semver)
Unaffected: v0.1.22 |
Credits
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CVE-2026-2299 (GCVE-0-2026-2299)
Vulnerability from cvelistv5 – Published: 2026-06-25 18:55 – Updated: 2026-06-26 14:05
VLAI
EPSS
VEX
Title
Improper Access Control in Mattermost Google Drive Plugin File Creation Endpoint
Summary
The Mattermost Google Drive plugin before version 1.1.0 fails to validate channel membership in the file creation endpoint, allowing authenticated users with a connected Google account to share Google Drive files to unauthorized private channels and disclose private channel membership.
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost Google Drive Plugin |
Affected:
0 , ≤ 1.0.0
(semver)
Unaffected: 1.1.0 |
Credits
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CVE-2026-8823 (GCVE-0-2026-8823)
Vulnerability from cvelistv5 – Published: 2026-06-22 13:41 – Updated: 2026-06-22 16:12
VLAI
EPSS
VEX
Title
User Manager can demote bot accounts to guest without bot-management permission
Summary
Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to validate bot targets when demoting users to guests which allows a lower-privileged administrator to degrade arbitrary bot accounts via the standard demote-user API.. Mattermost Advisory ID: MMSA-2026-00669
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.0
(semver)
Affected: 10.11.0 , ≤ 10.11.17 (semver) Unaffected: 11.8.0 Unaffected: 11.7.1 Unaffected: 10.11.18 |
Credits
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CVE-2026-6062 (GCVE-0-2026-6062)
Vulnerability from cvelistv5 – Published: 2026-06-22 13:40 – Updated: 2026-06-22 15:41
VLAI
EPSS
VEX
Title
IDOR in Jira plugin subscription edit endpoint
Summary
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 Fail to validate channel ownership of an existing subscription before applying edits which allows an authenticated attacker to hijack subscriptions from channels they have no access to via a crafted PUT request to the subscription edit endpoint.. Mattermost Advisory ID: MMSA-2026-00650
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.0
(semver)
Affected: 11.6.0 , ≤ 11.6.2 (semver) Affected: 11.5.0 , ≤ 11.5.5 (semver) Affected: 10.11.0 , ≤ 10.11.17 (semver) Unaffected: 11.8.0 Unaffected: 11.7.1 Unaffected: 11.6.3 Unaffected: 11.5.6 Unaffected: 10.11.18 |
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CVE-2026-6673 (GCVE-0-2026-6673)
Vulnerability from cvelistv5 – Published: 2026-06-22 13:38 – Updated: 2026-06-22 15:41
VLAI
EPSS
VEX
Title
Mattermost Jira plugin had unauthenticated {{/ac/installed}} lifecycle callback during pending Jira Cloud install
Summary
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654
Severity
6.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-306 - Missing Authentication for Critical Function
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.0
(semver)
Affected: 11.6.0 , ≤ 11.6.2 (semver) Affected: 11.5.0 , ≤ 11.5.5 (semver) Affected: 10.11.0 , ≤ 10.11.17 (semver) Unaffected: 11.8.0 Unaffected: 11.7.1 Unaffected: 11.6.3 Unaffected: 11.5.6 Unaffected: 10.11.18 |
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CVE-2026-8074 (GCVE-0-2026-8074)
Vulnerability from cvelistv5 – Published: 2026-06-22 13:37 – Updated: 2026-06-22 15:40
VLAI
EPSS
VEX
Title
Improper Permission Check Allows User Manager to Deactivate Bot Accounts
Summary
Mattermost versions 11.7.x <= 11.7.0, 10.11.x <= 10.11.17 fail to enforce bot-specific permission checks on the user active status endpoint, which allows a User Manager with user management write access but no Integrations access to deactivate bot accounts via the PUT /api/v4/users/{id}/active API endpoint.. Mattermost Advisory ID: MMSA-2026-00667
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.0
(semver)
Affected: 10.11.0 , ≤ 10.11.17 (semver) Unaffected: 11.8.0 Unaffected: 11.7.1 Unaffected: 10.11.18 |
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CVE-2026-9162 (GCVE-0-2026-9162)
Vulnerability from cvelistv5 – Published: 2026-06-22 13:36 – Updated: 2026-06-22 15:40
VLAI
EPSS
VEX
Title
Global session revocation does not invalidate active WebSocket connections
Summary
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to invalidate cached authentication state for active WebSocket connections during global session revocation, which allows a user with an existing WebSocket connection to remain authenticated and continue receiving real-time events until the cached session expires or the client reconnects.. Mattermost Advisory ID: MMSA-2026-00664
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-613 - Insufficient Session Expiration
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.0
(semver)
Affected: 11.6.0 , ≤ 11.6.2 (semver) Affected: 11.5.0 , ≤ 11.5.5 (semver) Affected: 10.11.0 , ≤ 10.11.17 (semver) Unaffected: 11.8.0 Unaffected: 11.7.1 Unaffected: 11.6.3 Unaffected: 11.5.6 Unaffected: 10.11.18 |
Credits
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CVE-2026-5139 (GCVE-0-2026-5139)
Vulnerability from cvelistv5 – Published: 2026-06-22 13:34 – Updated: 2026-06-22 15:39
VLAI
EPSS
VEX
Title
GitLab Plugin Allows Non-Admin Users to Modify Default Instance Configuration
Summary
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler, which allows any authenticated user to overwrite the global default GitLab instance configuration via the {{/gitlab connect <instance-name>}} slash command.. Mattermost Advisory ID: MMSA-2026-00644
Severity
5.4 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.0
(semver)
Affected: 11.6.0 , ≤ 11.6.2 (semver) Affected: 11.5.0 , ≤ 11.5.5 (semver) Affected: 10.11.0 , ≤ 10.11.17 (semver) Unaffected: 11.8.0 Unaffected: 11.7.1 Unaffected: 11.6.3 Unaffected: 11.5.6 Unaffected: 10.11.18 |
Credits
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CVE-2026-8683 (GCVE-0-2026-8683)
Vulnerability from cvelistv5 – Published: 2026-06-15 14:06 – Updated: 2026-06-15 16:06
VLAI
EPSS
VEX
Title
Overly long URLs crash the Mattermost Desktop App
Summary
Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
0 , ≤ 5.5.13
(semver)
Unaffected: 6.2.0 Unaffected: 5.13.6.0 |
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CVE-2026-6517 (GCVE-0-2026-6517)
Vulnerability from cvelistv5 – Published: 2026-06-15 13:55 – Updated: 2026-06-15 16:00
VLAI
EPSS
VEX
Title
Mattermost Desktop App fails to restrict the allow list of domains which NTLM credentials are passed
Summary
Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were forwarded to in the Mattermost Desktop App which allows any user on a server without the image proxy enabled to intercept other users credentials via embedding an image that routes to an external web server. Mattermost Advisory ID: MMSA-2026-00651
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-522 - Insufficiently Protected Credentials
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
0 , ≤ 5.5.13
(semver)
Unaffected: 6.2.0 Unaffected: 5.13.6.0 |
Credits
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CVE-2026-6961 (GCVE-0-2026-6961)
Vulnerability from cvelistv5 – Published: 2026-06-12 15:56 – Updated: 2026-06-16 13:17
VLAI
EPSS
VEX
Title
CVE-2026-6961: Path traversal via unsanitized FileInfo.Name in Mattermost federation sync
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661
Severity
7.6 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.6.0 , ≤ 11.6.1
(semver)
Affected: 11.5.0 , ≤ 11.5.4 (semver) Affected: 10.11.0 , ≤ 10.11.15 (semver) Affected: 10.11.0 , ≤ 10.11.16 (semver) Unaffected: 11.7.0 Unaffected: 11.6.2 Unaffected: 11.5.5 Unaffected: 10.11.16 Unaffected: 10.11.17 |
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CVE-2026-7387 (GCVE-0-2026-7387)
Vulnerability from cvelistv5 – Published: 2026-06-12 15:54 – Updated: 2026-06-13 03:56
VLAI
EPSS
VEX
Title
Mattermost group syncable endpoints allow privilege escalation via scheme_admin
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group members to team or channel admin via crafted API requests.. Mattermost Advisory ID: MMSA-2026-00665
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.6.0 , ≤ 11.6.1
(semver)
Affected: 11.5.0 , ≤ 11.5.4 (semver) Affected: 10.11.0 , ≤ 10.11.15 (semver) Affected: 10.11.0 , ≤ 10.11.16 (semver) Unaffected: 11.7.0 Unaffected: 11.6.2 Unaffected: 11.5.5 Unaffected: 10.11.16 Unaffected: 10.11.17 |
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CVE-2026-6046 (GCVE-0-2026-6046)
Vulnerability from cvelistv5 – Published: 2026-06-12 15:52 – Updated: 2026-06-12 17:18
VLAI
EPSS
VEX
Title
Plugin bot username conflict allows user account to be used as bot identity in Mattermost Server
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to validate that a username returned during bot registration belongs to a bot account, which allows an unprivileged attacker to intercept private messages sent by plugins via direct message channels by pre-registering a user account with a predictable plugin bot username.. Mattermost Advisory ID: MMSA-2026-00649
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.6.0 , ≤ 11.6.1
(semver)
Affected: 11.5.0 , ≤ 11.5.4 (semver) Affected: 10.11.0 , ≤ 10.11.15 (semver) Affected: 10.11.0 , ≤ 10.11.16 (semver) Unaffected: 11.7.0 Unaffected: 11.6.2 Unaffected: 11.5.5 Unaffected: 10.11.16 Unaffected: 10.11.17 |
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CVE-2026-6689 (GCVE-0-2026-6689)
Vulnerability from cvelistv5 – Published: 2026-06-12 15:51 – Updated: 2026-06-12 17:18
VLAI
EPSS
VEX
Title
*Missing* {{invite_user}} *permission check on team creation allows unprivileged users to set open-invite and allowed-domains team settings*
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Fail to enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation (the check was only applied on update/patch), which allows an authenticated user holding PermissionCreateTeam but not PermissionInviteUser on the resulting team to configure invite-controlled team settings (make the team publicly joinable via open invite and/or constrain membership via allowed domains) that they are not permitted to set on an existing team via POST /api/v4/teams with allow_open_invite: true and/or a non-empty allowed_domains in the request body.. Mattermost Advisory ID: MMSA-2026-00655
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-862 - Missing Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
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Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.6.0 , ≤ 11.6.1
(semver)
Affected: 11.5.0 , ≤ 11.5.4 (semver) Affected: 10.11.0 , ≤ 10.11.15 (semver) Affected: 10.11.0 , ≤ 10.11.16 (semver) Unaffected: 11.7.0 Unaffected: 11.6.2 Unaffected: 11.5.5 Unaffected: 10.11.16 Unaffected: 10.11.17 |
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CVE-2026-7184 (GCVE-0-2026-7184)
Vulnerability from cvelistv5 – Published: 2026-06-12 15:49 – Updated: 2026-06-12 17:19
VLAI
EPSS
VEX
Title
Mattermost Remote Cluster PATCH API Leaks Authentication Tokens
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15 fail to sanitize the Remote Cluster API response on PATCH operations, which allows authenticated users with the {{manage_secure_connections}} permission to obtain remote cluster authentication tokens via a PATCH request to the remote cluster endpoint.. Mattermost Advisory ID: MMSA-2026-00662
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-201 - Insertion of Sensitive Information Into Sent Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.6.0 , ≤ 11.6.1
(semver)
Affected: 11.5.0 , ≤ 11.5.4 (semver) Affected: 10.11.0 , ≤ 10.11.15 (semver) Unaffected: 11.7.0 Unaffected: 11.6.2 Unaffected: 11.5.5 Unaffected: 10.11.17 |
Credits
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CVE-2026-6739 (GCVE-0-2026-6739)
Vulnerability from cvelistv5 – Published: 2026-06-12 15:49 – Updated: 2026-06-13 03:56
VLAI
EPSS
VEX
Title
Mattermost: Delegated admins could patch protected default system roles
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to require system-level permission when patching protected default system roles, which allows authenticated users with delegated user-management permissions to escalate privileges by altering built-in role permissions via the role patch API.. Mattermost Advisory ID: MMSA-2026-00656
Severity
6.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.6.0 , ≤ 11.6.1
(semver)
Affected: 11.5.0 , ≤ 11.5.4 (semver) Affected: 10.11.0 , ≤ 10.11.15 (semver) Affected: 10.11.0 , ≤ 10.11.16 (semver) Unaffected: 11.7.0 Unaffected: 11.6.2 Unaffected: 11.5.5 Unaffected: 10.11.16 Unaffected: 10.11.17 |
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CVE-2026-3433 (GCVE-0-2026-3433)
Vulnerability from cvelistv5 – Published: 2026-06-12 15:46 – Updated: 2026-06-12 17:19
VLAI
EPSS
VEX
Title
Mattermost fails to scope role_updated websocket events to authorized team and channel members
Summary
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
1 reference
| URL | Tags |
|---|---|
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Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
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Affected:
11.6.0 , ≤ 11.6.1
(semver)
Affected: 11.5.0 , ≤ 11.5.4 (semver) Affected: 10.11.0 , ≤ 10.11.15 (semver) Affected: 10.11.0 , ≤ 10.11.16 (semver) Unaffected: 11.7.0 Unaffected: 11.6.2 Unaffected: 11.5.5 Unaffected: 10.11.16 Unaffected: 10.11.17 |
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