CVE-2025-55073: Mattermost allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL
(updated )
Mattermost versions 10.11.x <= 10.11.3, 10.5.x <= 10.5.11, 10.12.x <= 10.12.0 fail to validate the relationship between the post being updated and the MSTeams plugin OAuth flow which allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL.
References
- github.com/advisories/GHSA-ff85-qw3h-g9vp
- github.com/mattermost/mattermost
- github.com/mattermost/mattermost/commit/375ce229f4923205394d8f27925372b2cbf28130
- github.com/mattermost/mattermost/commit/6c288aa62bb3343183ec1d0a06360d14aa0193e9
- github.com/mattermost/mattermost/commit/a41db04d2746ab549d056db4ede4cd803f64989c
- github.com/mattermost/mattermost/commit/b822cea06bf5683a176e2c92711241bd29cd9389
- github.com/mattermost/mattermost/commit/e47349ea0fc072ee1dfb196d9bb1c8fd1a589224
- mattermost.com/security-updates
- nvd.nist.gov/vuln/detail/CVE-2025-55073
Code Behaviors & Features
Detect and mitigate CVE-2025-55073 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 →