CVE-2025-58073: Mattermost Server

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Mattermost versions 10.11.x <= 10.11.1, 10.10.x <= 10.10.2, 10.5.x <= 10.5.10 fail to verify a user has permission to join a Mattermost team using the original invite token which allows any attacked to join any team on a Mattermost server regardless of restrictions via manipulating the OAuth state.

Affected products

• Mattermost Mattermost Server: from 10.5.0, before 10.5.11 (fixed in 10.5.11); from 10.10.0, before 10.10.3 (fixed in 10.10.3); from 10.11.0, before 10.11.3 (fixed in 10.11.3)

Published 2025-10-16. Last modified 2026-06-17.