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CVE-2026-20796

LOW CVSS: 3.1 Published: 2026-02-13 Modified: 2026-06-17

Description

Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-367

References