{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.8 or later.","affected":[{"fixed":"10.11.8","introduced":"10.11.0"},{"fixed":"10.12.4","introduced":"10.12.0"},{"fixed":"11.0.6","introduced":"11.0.0"},{"fixed":"11.1.1","introduced":"11.1.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-13767"],"ecosystem":"Go","epss":0.00194,"exploited":false,"fixed_versions":["10.11.8","10.12.4","11.0.6","11.1.1"],"ghsa_id":"GHSA-fmqf-pmcm-8cx9","id":"tcs_01M5KF9G1P99SAQ6XVEZ3EQ3VW","modified_at":"2026-02-27T22:04:19Z","published_at":"2025-12-24T09:30:22Z","references":["https://osv.dev/vulnerability/GHSA-fmqf-pmcm-8cx9","https://nvd.nist.gov/vuln/detail/CVE-2025-13767","https://github.com/mattermost/mattermost/pull/34551","https://github.com/mattermost/mattermost/commit/b57c297c6d7ae6812d85e32a625806ac9555deee","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates","https://pkg.go.dev/vuln/GO-2026-4259"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-fmqf-pmcm-8cx9#Go/github.com/mattermost/mattermost-server","url":"https://osv.dev/vulnerability/GHSA-fmqf-pmcm-8cx9"}],"summary":"Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues"}