GitHub Advisoryadvisory · Go

GHSA-2xf7-hmf6-p64j Mattermost doesn't properly validate channel membership at the time of data retrieval

LOW Published 2026-02-13 Modified 2026-02-13 Official page ↗
Aliases
CVE-2026-20796
Ecosystem
Go
Packages
github.com/mattermost/mattermost-server
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-367
Reviewed
2026-02-13

Affected packages

• Go github.com/mattermost/mattermost-server: >= 10.11.0, < 10.11.10 → fixed in 10.11.10

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

Related

Alias · CVE (1)

  • CVE-2026-20796 Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a… vulnerability

Weakness · CWE (1)

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

References