Mattermost fail to prompt for explicit approval before adding a team admin to a private channel

GHSA-cw7q-5cgc-h3h9 · BIT-mattermost-2025-27715 · CVE-2025-27715 · GO-2025-3555

Published Mar 21, 2025 · Modified Mar 28, 2025

Description

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.

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-27715
PACKAGE https://github.com/mattermost/mattermost
WEB https://mattermost.com/security-updates

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