VULNERABILITY INTELLIGENCE

CVE-2026-20796

CVSS score3.1 LOW
EPSS probability0.22%
CISA KEVNot currently listed
Published2026-02-13
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

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

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-367

Primary references