CyberRota Analysis
This is a critical severity vulnerability with a CVSS score of 9.9. Exploitation may require the attacker to be authenticated.
CVE
CVE-2025-12419
Severity
CRITICAL
CVSS
9.9
EPSS
0.35%
Original NVD Description
Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.
Related CVEs
Other vulnerabilities affecting the same vendor(s)