{"action":"Upgrade github.com/mattermost/mattermost-server to 9.11.18+incompatible or later.","affected":[{"fixed":"9.11.18+incompatible","introduced":"9.11.0+incompatible"},{"fixed":"10.5.9+incompatible","introduced":"10.5.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-53971"],"ecosystem":"Go","epss":0.00203,"exploited":false,"fixed_versions":["9.11.18+incompatible","10.5.9+incompatible"],"ghsa_id":"GHSA-4276-cm8c-788h","id":"tcs_01M5KG9YDJWYV24NMMB7YFQSQE","modified_at":"2026-03-03T04:56:51.532495Z","published_at":"2025-08-29T14:52:20Z","references":["https://osv.dev/vulnerability/GO-2025-3902","https://github.com/advisories/GHSA-4276-cm8c-788h","https://nvd.nist.gov/vuln/detail/CVE-2025-53971","https://mattermost.com/security-updates"],"severity":{"label":"low","score":3.8},"sources":[{"source":"osv","source_id":"GO-2025-3902","url":"https://osv.dev/vulnerability/GO-2025-3902"},{"source":"nvd","source_id":"CVE-2025-53971","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-53971"}],"summary":"Mattermost Fails to Properly Validate Team Role Modification in github.com/mattermost/mattermost-server"}