{"action":"Upgrade github.com/mattermost/mattermost-server to 10.5.12 or later.","affected":[{"fixed":"10.11.4","introduced":"10.11.0"},{"fixed":"10.5.12","introduced":"10.5.0"},{"fixed":"10.12.1","introduced":"10.12.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-55073"],"ecosystem":"Go","epss":0.00196,"exploited":false,"fixed_versions":["10.11.4","10.5.12","10.12.1"],"ghsa_id":"GHSA-ff85-qw3h-g9vp","id":"tcs_01M5KF913Y2V8CEENRFRZ56CFF","modified_at":"2025-11-18T16:13:46.897397Z","published_at":"2025-11-14T09:30:27Z","references":["https://osv.dev/vulnerability/GHSA-ff85-qw3h-g9vp","https://nvd.nist.gov/vuln/detail/CVE-2025-55073","https://github.com/mattermost/mattermost/commit/375ce229f4923205394d8f27925372b2cbf28130","https://github.com/mattermost/mattermost/commit/6c288aa62bb3343183ec1d0a06360d14aa0193e9","https://github.com/mattermost/mattermost/commit/a41db04d2746ab549d056db4ede4cd803f64989c","https://github.com/mattermost/mattermost/commit/b822cea06bf5683a176e2c92711241bd29cd9389","https://github.com/mattermost/mattermost/commit/e47349ea0fc072ee1dfb196d9bb1c8fd1a589224","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"GHSA-ff85-qw3h-g9vp","url":"https://osv.dev/vulnerability/GHSA-ff85-qw3h-g9vp"}],"summary":"Mattermost allows an attacker to edit arbitrary posts via a crafted MSTeams plugin OAuth redirect URL"}