PT-2025-46871 · Mattermost · Mattermost

Xiangyu Guo

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Published

2025-11-13

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Updated

2026-01-06

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CVE-2025-11777

CVSS v3.1

4.3

Medium

VectorAV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Name of the Vulnerable Software and Affected Versions Mattermost versions 10.5.0 through 10.5.11 Mattermost versions 10.11.0 through 10.11.3
Description The software does not properly validate team membership permissions in the Add Channel Member API. This allows users from one team to access user metadata and channel membership information from other teams. The affected API endpoint is used to add members to channels. The issue allows unauthorized access to information from other teams via the API.
Recommendations Update Mattermost to a version later than 10.5.11. Update Mattermost to a version later than 10.11.3.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2025-11777
GHSA-MQCJ-8C2G-H97Q
GO-2025-4122
SUSE-SU-2026:0037-1

Affected Products

Mattermost