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CVE-2025-55074

Good to know:

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Date: November 18, 2025

Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11 fail to enforce access permissions on the Agents plugin which allows other users to determine when users had read channels via channel member objects

Severity Score

Related Resources (10)

https://nvd.nist.gov/vuln/detail/CVE-2025-55074
https://github.com/mattermost/mattermost/commit/d72d437f1567ba0b639b6e4fd73bab06c51baab5
https://github.com/mattermost/mattermost/commit/98acefe911dd9de7edf47a7d825dd99f53141a52
https://github.com/advisories/GHSA-9hh7-6558-qfp2
https://github.com/mattermost/mattermost/pull/33835
https://github.com/mattermost/mattermost
https://github.com/mattermost/mattermost/pull/33905
https://github.com/mattermost/mattermost/commit/ba86dfc5876b354b9d3c20ff45c08ca6f8426149
https://mattermost.com/security-updates
https://www.mend.io/vulnerability-database/CVE-2025-55074

Severity Score

Weakness Type (CWE)

Incorrect Default Permissions

CWE-276

Improper Validation of Generative AI Output

CWE-1426

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 - v10.5.12+incompatible

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CVSS v3.1

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

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