{"action":"Upgrade github.com/mattermost/mattermost-server to 9.11.18 or later.","affected":[{"fixed":"10.5.9","introduced":"10.5.0"},{"fixed":"9.11.18","introduced":"9.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-53971"],"ecosystem":"Go","epss":0.00203,"exploited":false,"fixed_versions":["10.5.9","9.11.18"],"ghsa_id":"GHSA-4276-cm8c-788h","id":"tcs_01M5KEVKPD3WPMWRE6BYEMR3WP","modified_at":"2025-08-29T20:57:09Z","published_at":"2025-08-21T09:30:21Z","references":["https://osv.dev/vulnerability/GHSA-4276-cm8c-788h","https://nvd.nist.gov/vuln/detail/CVE-2025-53971","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates","https://pkg.go.dev/vuln/GO-2025-3902"],"severity":{"label":"low","score":3.8},"sources":[{"source":"osv","source_id":"GHSA-4276-cm8c-788h","url":"https://osv.dev/vulnerability/GHSA-4276-cm8c-788h"}],"summary":"Mattermost Fails to Properly Validate Team Role Modification"}