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CVE-2025-27715

Auto-Enrollment of Team Admins into Private Channels without explicit consent

CVSS 3.3 LOWEPSS 0.2%CWE-863
Mattermost versions 9.11.x <= 9.11.8 fail to prompt for explicit approval before adding a team admin to a private channel, which team admins to joining private channels via crafted permalink links without explicit consent from them.
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N
Affected products
Mattermost · Mattermost

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References
https://mattermost.com/security-updates