CVE-2025-55074

Channel member objects leak read status

Published Nov 18, 2025 CVSS 3.1 · 3 Low EPSS < 1% KEV · Not listed
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

Remediation

Vendor Solution

Update Mattermost to versions 11.0.0, 10.11.4, 10.5.12 or higher.

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-9hh7-6558-qfp2 Mattermost allows other users to determine when users had read channels via channel member objects
References
History
Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server
Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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
Title Channel member objects leak read status
Weaknesses CWE-1426
References
Metrics cvssV3_1

{'score': 3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:N/A:N'}

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Nov 18, 2025, 9:03 PM
Reserved
Oct 15, 2025, 11:42 AM
Status
Analyzed
Published
Nov 18, 2025, 4:15 PM
Modified
Oct 19, 2026, 1:10 PM