GitHub Advisoryadvisory · Go

GHSA-57cc-2pf4-mhmx Mattermost fails to properly validate team membership when processing channel mentions

MEDIUM Published 2026-02-16 Modified 2026-02-19 Official page ↗
Aliases
CVE-2025-14350
Ecosystem
Go
Packages
github.com/mattermost/mattermost/server/v8, github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-862
Reviewed
2026-02-19

Affected packages

• Go github.com/mattermost/mattermost/server/v8: < 8.0.0-20251209134645-761e56bb11cc → fixed in 8.0.0-20251209134645-761e56bb11cc • Go github.com/mattermost/mattermost-server: < 11.1.3 (no fix yet) • Go github.com/mattermost/mattermost-server: < 10.11.10 (no fix yet) • Go github.com/mattermost/mattermost-server: < 11.2.2 (no fix yet) • Go github.com/mattermost/mattermost-server: < 5.3.2-0.20251209134645-761e56bb11cc → fixed in 5.3.2-0.20251209134645-761e56bb11cc

Description

Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563

Related

Alias · CVE (1)

  • CVE-2025-14350 Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing… vulnerability

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References