PT-2026-7984

CVE-2026-20796

Published

2026-02-13

Updated

2026-07-30

Description by

CVSS 3.1

3.1

Low

MetricsAV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Mattermost versions 10.11.0 through 10.11.9

Description Mattermost versions 10.11.0 through 10.11.9 do not properly validate channel membership when retrieving data, potentially allowing a deactivated user to learn team names they should not have access to. This occurs due to a race condition in the /common teams API endpoint.

Recommendations Update to a version later than 10.11.9.

Exploitability

Exploit

Fix

Impacts

Researchers

Juho Forsén

Vendors

Affected products

Weakness enumeration

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

Related identifiers