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CVE-2025-11777

Good to know:

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Date: November 13, 2025

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to properly validate team membership permissions in the Add Channel Member API which allows users from one team to access user metadata and channel membership information from other teams via the API endpoint

Severity Score

Related Resources (8)

https://github.com/mattermost/mattermost/commit/d72d437f1567ba0b639b6e4fd73bab06c51baab5
https://github.com/mattermost/mattermost/commit/98acefe911dd9de7edf47a7d825dd99f53141a52
https://github.com/mattermost/mattermost
https://nvd.nist.gov/vuln/detail/CVE-2025-11777
https://github.com/advisories/GHSA-mqcj-8c2g-h97q
https://github.com/mattermost/mattermost/commit/ba86dfc5876b354b9d3c20ff45c08ca6f8426149
https://mattermost.com/security-updates
https://www.mend.io/vulnerability-database/CVE-2025-11777

Severity Score

Weakness Type (CWE)

Incorrect Authorization

CWE-863

Top Fix

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Upgrade Version

Upgrade to version github.com/mattermost/mattermost-server - v10.11.4;github.com/mattermost/mattermost-server - v10.5.12;github.com/mattermost/mattermost/server/v8 - v8.0.0-20250905150616-ba86dfc5876b;https://github.com/mattermost/mattermost.git - v10.11.4;https://github.com/mattermost/mattermost.git - v10.5.12

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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