CVE-2025-55074

Channel member objects leak read status

State: Published
Severity: 3.0 Low
Published: Nov 18, 2025
Updated: Nov 18, 2025
Reserved: Oct 15, 2025

Description

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

Scores

CVSS	Score	Vector	Source
3.1	3.0 Low	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N	Mattermost

Weaknesses

CWE-1426 Improper Validation of Generative AI Output

Affected Products

Product	Versions
MattermostMattermost	10.11.0 through 10.11.3Affected 10.5.0 through 10.5.11Affected 11.0.0Not affected 10.11.4Not affected 10.5.12Not affected

References

https://mattermost.com/security-updates

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