{“lastseen”:””,”description”:”Mattermost versions 10.12.x \\u003c= 10.12.1, 10.11.x \\u003c= 10.11.4, 10.5.x \\u003c= 10.5.12, 11.0.x \\u003c= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation or admin privileges to take over any user account via manipulation of authentication data during the OAuth completion flow”,”published”:”2025-11-27T15:55:44.815Z”,”modified”:”2025-11-27T15:55:44.815Z”,”type”:”cve”,”title”:”Account takeover on OAuth\/OpenID-enabled servers”,”source”:”Mattermost”,”references”:”https:\/\/mattermost.com\/security-updates”,”id”:”CVE-2025-12419″,”bulletinFamily”:””,”cwe”:[“CWE-303″],”cvelist”:null,”sourceData”:”Mattermost Mattermost 10.12.0\\nMattermost Mattermost 10.11.0\\nMattermost Mattermost 10.5.0\\nMattermost Mattermost 11.0.0″,”sourceHref”:””,”cvss”:{“score”:9.9,”severity”:”CRITICAL”,”vector”:”CVSS:3.1\/AV:N\/AC:L\/PR:L\/UI:N\/S:C\/C:H\/I:H\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”Mattermost”,”version”:”10.12.0″,”vendor”:”Mattermost”,”ai_description”:”Account takeover vulnerability due to improper validation of OAuth state tokens during OpenID Connect authentication”,”ai_severity”:”Critical”,”ai_vendor”:”Mattermost”,”ai_product”:”Mattermost”,”ai_version”:”10.12.1, 10.11.4, 10.5.12, 11.0.3″,”ai_score”:9.9}<\/p>\n","protected":false},"excerpt":{"rendered":"
{“lastseen”:””,”description”:”Mattermost versions 10.12.x \\u003c= 10.12.1, 10.11.x \\u003c= 10.11.4, 10.5.x \\u003c= 10.5.12, 11.0.x \\u003c= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[9,6,8,45,12,13,7,11,5],"class_list":["post-27854","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-critical","tag-cve","tag-cvss","tag-cvss-99","tag-exploit","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n