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471 vulnerabilities
CVE-2026-75587 (GCVE-0-2026-75587)
Vulnerability from cvelistv5 – Published: 2026-08-17 22:09 – Updated: 2026-08-18 14:20
VLAI
EPSS
VEX
Title
Plaintext pre-auth secret exposure via Desktop App diagnostics report
Summary
Mattermost Desktop App versions <=6.2 6.2.2.0 fail to redact the pre-auth secret when generating a diagnostics report, which allows a local attacker with access to a user's diagnostics report or log files to obtain the plaintext pre-auth secret configured for a connected server via inspecting the Server Connectivity (Step-3) diagnostics output. Mattermost Advisory ID: MMSA-2026-00716
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 14:19 UTC
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:
0 , ≤ 6.2.2
(semver)
Unaffected: 6.3.0 Unaffected: 6.2.3.0 |
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CVE-2026-9693 (GCVE-0-2026-9693)
Vulnerability from cvelistv5 – Published: 2026-08-17 22:07 – Updated: 2026-08-18 14:21
VLAI
EPSS
VEX
Title
Mattermost thread memberships persist after team removal, exposing private channel thread metadata on re-invite
Summary
Mattermost versions 10.11.x <= 10.11.20, 11.7.x <= 11.7.5 Mattermost fails to remove thread membership records when a user is removed from or leaves a team, which allows a previously removed user who is later re-invited to the team to view private channel thread root post content and metadata via the team threads API.. Mattermost Advisory ID: MMSA-2026-00682
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 14:20 UTC
CWE
- CWE-459 - Incomplete Cleanup
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 , ≤ 10.11.20
(semver)
Affected: 11.7.0 , ≤ 11.7.5 (semver) Unaffected: 11.9.0 Unaffected: 10.11.21 Unaffected: 11.7.6 |
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CVE-2026-9859 (GCVE-0-2026-9859)
Vulnerability from cvelistv5 – Published: 2026-08-17 22:06 – Updated: 2026-08-18 14:22
VLAI
EPSS
VEX
Title
Mattermost Boards plugin didn’t enforce role-based authorization on board channel link allowing board editors to expose boards to arbitrary channels
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to enforce PermissionManageBoardRoles on the channelId field of the batch endpoint, which allows an authenticated board editor to relink any board they can edit to an arbitrary channel via a crafted PATCH request. Mattermost Advisory ID: MMSA-2026-00686
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 14:21 UTC
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Affected: 11.8.0 , ≤ 11.8.3 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 Unaffected: 11.8.4 |
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CVE-2026-9816 (GCVE-0-2026-9816)
Vulnerability from cvelistv5 – Published: 2026-08-17 22:05 – Updated: 2026-08-18 15:26
VLAI
EPSS
VEX
Title
Insufficient server-side validation of board member role fields permits privilege escalation
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to validate BoardMember.Scheme* fields server-side on insert and archive-import paths which allows a board editor or non-guest team member to grant board admin to arbitrary users via POST /api/v2/boards/{boardID}/members and POST /api/v2/teams/{teamID}/archive/import.. Mattermost Advisory ID: MMSA-2026-00685
Severity
8.3 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 15:23 UTC
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Affected: 11.8.0 , ≤ 11.8.3 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 Unaffected: 11.8.4 |
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CVE-2026-10080 (GCVE-0-2026-10080)
Vulnerability from cvelistv5 – Published: 2026-08-17 22:04 – Updated: 2026-08-18 15:23
VLAI
EPSS
VEX
Title
Boards plugin panics on WebSocket command with non-string field types
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to validate WebSocket command field types which allows an authenticated user to crash the plugin process and deny service to all Boards users via a custom_focalboard_SUBSCRIBE_TEAM message with a non-string teamId.. Mattermost Advisory ID: MMSA-2026-00687
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 15:23 UTC
CWE
- CWE-704 - Incorrect Type Conversion or Cast
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Affected: 11.8.0 , ≤ 11.8.3 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 Unaffected: 11.8.4 |
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CVE-2026-10527 (GCVE-0-2026-10527)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:37 – Updated: 2026-08-17 15:25
VLAI
EPSS
VEX
Title
Boards plugin retains Board Admin rights for users demoted to System Guest
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fails to reconcile SchemeAdmin flags with a user's current role which allows a user demoted to System Guest to retain Board Admin privileges and perform admin-only operations via the Boards REST API or UI.. Mattermost Advisory ID: MMSA-2026-00691
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:50 UTC
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Affected: 11.8.0 , ≤ 11.8.3 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 Unaffected: 11.8.4 |
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CVE-2026-15754 (GCVE-0-2026-15754)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:36 – Updated: 2026-08-17 15:25
VLAI
EPSS
VEX
Title
Missing per-channel team-scope check in ABAC access control policy unassign allows cross-team policy removal
Summary
Mattermost versions 11.7.x <= 11.7.6, 11.8.x <= 11.8.3 The access control policy unassign endpoint fails to re-validate that each target channel still belongs to the requesting admin's team, which allows an authenticated team administrator to remove ABAC (attribute-based access control) policy assignments from channels outside their team via the policy unassign API after a channel has been moved to another team.. Mattermost Advisory ID: MMSA-2026-00718
Severity
4.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:50 UTC
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 , ≤ 11.7.6
(semver)
Affected: 11.8.0 , ≤ 11.8.3 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 11.8.4 |
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CVE-2026-16044 (GCVE-0-2026-16044)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:26 – Updated: 2026-08-17 15:25
VLAI
EPSS
VEX
Title
Insufficient validation of guest board admin privileges on archive import
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to prevent guest users from receiving Board Admin privileges during board archive import which allows a board member to escalate a guest user to Board Admin via importing a crafted .boardarchive file. Mattermost Advisory ID: MMSA-2026-00672
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:50 UTC
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 |
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CVE-2026-16045 (GCVE-0-2026-16045)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:26 – Updated: 2026-08-17 15:26
VLAI
EPSS
VEX
Title
Delegated OAuth tokens could revoke unrelated OAuth application authorizations
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 Mattermost failed to restrict OAuth deauthorization and personal access token management endpoints to direct user sessions, which allowed an OAuth app with a delegated user token to revoke the user's authorizations or tokens for other integrations via account-management endpoints.. Mattermost Advisory ID: MMSA-2026-00704
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:50 UTC
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 |
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CVE-2026-16049 (GCVE-0-2026-16049)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:25 – Updated: 2026-08-17 15:26
VLAI
EPSS
VEX
Title
_GitLab Plugin allows cross-channel post injection and phishing via missing channel permission checks in issue API endpoints_
Summary
Mattermost Plugins versions <=11.8 10.20.11 11.5.7.0 _The Mattermost GitLab plugin fails to verify channel permissions when processing API requests with a caller-supplied_ {{post_id}}_, and fails to validate the_ {{web_url}} _parameter against the configured GitLab instance, which allows an authenticated attacker to inject bot-authored messages containing arbitrary URLs into channels they do not have access to via the_ {{createIssue}} _and_ {{attachCommentToIssue}} _API endpoints._ Mattermost Advisory ID: MMSA-2026-00673
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:51 UTC
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:
0 , ≤ 10.20.11
(semver)
Affected: 0 , ≤ 11.5.7 (semver) Unaffected: 11.9.0 Unaffected: 10.11.21 Unaffected: 11.7.6 |
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CVE-2026-16047 (GCVE-0-2026-16047)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:25 – Updated: 2026-08-17 15:26
VLAI
EPSS
VEX
Title
Board channel linking without read channel permission validation
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21, 11.8.x <= 11.8.3 fail to validate that users have read access to a channel before linking a board to it, which allows an authenticated attacker to discover the membership of private channels on the same team via creating, patching, importing, or bulk-creating boards with an arbitrary channelId. Mattermost Advisory ID: MMSA-2026-00674
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:51 UTC
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Affected: 11.8.0 , ≤ 11.8.3 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 Unaffected: 11.8.4 |
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CVE-2026-16046 (GCVE-0-2026-16046)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:24 – Updated: 2026-08-18 13:22
VLAI
EPSS
VEX
Title
Missing run-state validation on finished playbook runs
Summary
Mattermost versions 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to enforce run-state validation on write operations for finished playbook runs which allows a run participant to modify status, checklists, retrospective content, ownership, and participants on completed runs via REST and GraphQL API requests. Mattermost Advisory ID: MMSA-2026-00675
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:51 UTC
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 , ≤ 11.7.6
(semver)
Affected: 10.11.0 , ≤ 10.11.21 (semver) Unaffected: 11.9.0 Unaffected: 11.7.7 Unaffected: 10.11.22 |
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CVE-2026-16048 (GCVE-0-2026-16048)
Vulnerability from cvelistv5 – Published: 2026-08-17 14:22 – Updated: 2026-08-17 15:37
VLAI
EPSS
VEX
Title
Channel member roles accept out-of-scope roles
Summary
Mattermost versions 11.8.x <= 11.8.2, 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697
Severity
6.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 14:51 UTC
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
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(semver)
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CVE-2026-14298 (GCVE-0-2026-14298)
Vulnerability from cvelistv5 – Published: 2026-08-13 08:03 – Updated: 2026-08-13 14:16
VLAI
EPSS
VEX
Title
Denial of service via resource exhaustion in Mattermost
Summary
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to properly limit resource consumption when processing certain user-supplied input, which allows an authenticated user to cause a denial of service. Mattermost Advisory ID: MMSA-2026-00713
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 14:16 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.9.0 , ≤ 11.9.0
(semver)
Affected: 11.8.0 , ≤ 11.8.4 (semver) Affected: 11.7.0 , ≤ 11.7.7 (semver) Affected: 10.11.0 , ≤ 10.11.22 (semver) Unaffected: 11.10.0 Unaffected: 11.9.1 Unaffected: 11.8.5 Unaffected: 11.7.8 Unaffected: 10.11.23 |
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CVE-2026-7521 (GCVE-0-2026-7521)
Vulnerability from cvelistv5 – Published: 2026-07-28 13:58 – Updated: 2026-07-28 14:48
VLAI
EPSS
VEX
Title
SAML certificate deletion allows path traversal to delete arbitrary files outside the config directory
Summary
Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666
Severity
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-28 14:47 UTC
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:
11.8.0 , ≤ 11.8.0
(semver)
Affected: 11.7.0 , ≤ 11.7.3 (semver) Affected: 11.6.0 , ≤ 11.6.5 (semver) Affected: 10.11.0 , ≤ 10.11.20 (semver) Unaffected: 11.9.0 Unaffected: 11.8.1 Unaffected: 11.7.4 Unaffected: 11.6.6 Unaffected: 10.11.21 |
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CVE-2026-10819 (GCVE-0-2026-10819)
Vulnerability from cvelistv5 – Published: 2026-07-27 14:15 – Updated: 2026-07-27 15:05
VLAI
EPSS
VEX
Title
Mattermost Server Denial of Service via Animated GIF Emoji Upload
Summary
Mattermost versions 11.6.x <= 11.6.5, 10.11.x <= 10.11.20, 11.8.x <= 11.8.1, 11.7.x <= 11.7.4 fail to limit the number of frames and enforce the file size cap on animated GIF uploads, which allows an authenticated attacker to cause a denial of service via a crafted animated GIF uploaded as a custom emoji.. Mattermost Advisory ID: MMSA-2026-00695
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 15:05 UTC
CWE
- CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)
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 , ≤ 11.6.5
(semver)
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CVE-2026-10600 (GCVE-0-2026-10600)
Vulnerability from cvelistv5 – Published: 2026-07-27 14:13 – Updated: 2026-07-27 15:04
VLAI
EPSS
VEX
Title
Denial of service via unbounded document content extraction in Mattermost Server
Summary
Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to bound the time and resource consumption of server-side document content extraction which allows an authenticated user with file-upload permission to degrade file uploads for all users on the server via repeatedly uploading small documents that are cheap to upload but expensive to extract, saturating the shared extraction worker pool.. Mattermost Advisory ID: MMSA-2026-00694
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 15:04 UTC
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:
11.8.0 , ≤ 11.8.0
(semver)
Affected: 11.7.0 , ≤ 11.7.3 (semver) Affected: 11.6.0 , ≤ 11.6.5 (semver) Affected: 10.11.0 , ≤ 10.11.20 (semver) Unaffected: 11.9.0 Unaffected: 11.8.1 Unaffected: 11.7.4 Unaffected: 11.6.6 Unaffected: 10.11.21 |
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CVE-2026-8075 (GCVE-0-2026-8075)
Vulnerability from cvelistv5 – Published: 2026-07-17 10:05 – Updated: 2026-07-17 12:53
VLAI
EPSS
VEX
Title
Posting a malicious markdown image crashes the Mattermost Desktop App
Summary
Mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which allows any user to crash another channel members Desktop App via posting a malicious link with an embedded image that misses one of those headers. Mattermost Advisory ID: MMSA-2026-00668
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 12:53 UTC
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
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)
Affected: 0 , ≤ 6.0.2 (semver) Unaffected: 6.3.0 Unaffected: 5.13.6.0 Unaffected: 6.2.1.0 |
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CVE-2026-9602 (GCVE-0-2026-9602)
Vulnerability from cvelistv5 – Published: 2026-07-17 10:03 – Updated: 2026-07-17 12:54
VLAI
EPSS
VEX
Title
Mattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods
Summary
Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678
Severity
5.7 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 12:54 UTC
CWE
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
0 , ≤ 6.0.2
(semver)
Affected: 0 , ≤ 5.6.13 (semver) Unaffected: 6.3.0 Unaffected: 6.2.1.0 Unaffected: 5.13.7.0 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:09 UTC
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 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:09 UTC
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 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:10 UTC
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 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:55 UTC
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 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:56 UTC
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)
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:56 UTC
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 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:56 UTC
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 |
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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 14:44 UTC
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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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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 14:18 UTC
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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CVE-2026-9571 (GCVE-0-2026-9571)
Vulnerability from cvelistv5 – Published: 2026-07-13 07:50 – Updated: 2026-07-15 04:00
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 00:00 UTC
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 · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 15:40 UTC
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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