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GHSA-3X39-62H4-F8J6 Mattermost fails to properly validate OAuth state tokens during OpenID Connect authentication

🗓️ 27 Nov 2025 18:30:25Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 7 Views

Mattermost OIDC state validation flaw enables takeover by attackers with team creation rights when email verification is disabled and two SSO users are controlled.

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17 Dec 2025 00:58Current
6.6Medium risk
Vulners AI Score6.6
CVSS 3.19.9
EPSS0.00346
7