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CVE-2025-53971 Channel and Team Membership APIs inadvertently allow loss of Member privileges.

🗓️ 21 Aug 2025 07:31:01Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 4 Views

Mattermost versions 10.5.x and 9.11.x fail authorization checks, enabling team admins to demote to guests via the schemeRoles endpoint.

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15 Jul 2026 01:49Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.13.8
EPSS0.00189
4