{"id":"CVE-2025-12419","revision":"d84c1d22278c4e79b6dbc6e647cc5f3c","records":[{"revision":"d84c1d22278c4e79b6dbc6e647cc5f3c","observedAt":"2026-10-25T01:17:23.283+00:00","statement":{"source":"nvd","id":"CVE-2025-12419","aliases":[],"title":"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 priv…","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.","state":0,"publishedAt":"2025-11-27T16:15:46.957+00:00","modifiedAt":"2026-10-19T13:10:00.11+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · responsibledisclosure@mattermost.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":9.9,"severity":"CRITICAL"}],"references":["https://mattermost.com/security-updates"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-12419","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-303"],"productCriteria":["cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2025-11-27T16:15:46.957","lastModified":"2026-10-19T13:10:00.110"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2025-12419","identifiers":["CVE-2025-12419"]},"retained":false,"historicalAffected":[]}],"coverage":[]}