Mattermost 10.5.x-10.11.3 Agents Plugin Access Control Bypass
CVE-2025-55074 Published on November 18, 2025
Channel member objects leak read status
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
Vulnerability Analysis
CVE-2025-55074 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
Products Associated with CVE-2025-55074
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Affected Versions
Mattermost:- Version 10.11.0, <= 10.11.3 is affected.
- Version 10.5.0, <= 10.5.11 is affected.
- Version 11.0.0 is unaffected.
- Version 10.11.4 is unaffected.
- Version 10.5.12 is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.