CVE-2025-9084: Mattermost Open Redirect vulnerability

September 15, 2025 (updated September 16, 2025)

Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs.

References

github.com/advisories/GHSA-hm95-jx66-g2gh
github.com/mattermost/mattermost
github.com/mattermost/mattermost/commit/39bd251fe4f66b7e847fc6d653221886347ff160
mattermost.com/security-updates
nvd.nist.gov/vuln/detail/CVE-2025-9084

Code Behaviors & Features

Detect and mitigate CVE-2025-9084 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →