{"id":"CVE-2025-12419","revision":"8f4f5e299334458c804147ca0305badf","records":[{"revision":"8f4f5e299334458c804147ca0305badf","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-12419","aliases":[],"title":"Account takeover on OAuth/OpenID-enabled servers","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":"2025-11-27T15:55:44.815+00:00","modifiedAt":"2026-02-26T16:07:27.036+00:00","affected":[{"ecosystem":"Vendor product","name":"Mattermost","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"Mattermost\",\n                    \"vendor\": \"Mattermost\",\n                    \"versions\": [\n                        {\n                            \"lessThanOrEqual\": \"10.12.1\",\n                            \"status\": \"affected\",\n                            \"version\": \"10.12.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"10.11.4\",\n                            \"status\": \"affected\",\n                            \"version\": \"10.11.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"10.5.12\",\n                            \"status\": \"affected\",\n                            \"version\": \"10.5.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"lessThanOrEqual\": \"11.0.3\",\n                            \"status\": \"affected\",\n                            \"version\": \"11.0.0\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"11.1.0\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"10.12.2\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"10.11.5\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"10.5.13\",\n                            \"status\": \"unaffected\"\n                        },\n                        {\n                            \"version\": \"11.0.4\",\n                            \"status\": \"unaffected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","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://www.cve.org/CVERecord?id=CVE-2025-12419","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-12419","identifiers":["CVE-2025-12419"]},"retained":false,"historicalAffected":[]}],"coverage":[]}