CVE-2025-31947: Mattermost Fails to Lockout LDAP Users After Repeated Login Failures

May 15, 2025 (updated May 17, 2025)

Mattermost versions 10.6.x <= 10.6.1, 10.5.x <= 10.5.2, 10.4.x <= 10.4.4, 9.11.x <= 9.11.11 fail to lockout LDAP users following repeated login failures, which allows attackers to lock external LDAP accounts through repeated login failures through Mattermost.

References

github.com/advisories/GHSA-qgwx-rffp-6cx9
github.com/mattermost/mattermost
github.com/mattermost/mattermost/pull/30821
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-31947

Code Behaviors & Features

Detect and mitigate CVE-2025-31947 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →