{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.8+incompatible or later.","affected":[{"fixed":"10.11.8+incompatible","introduced":"10.11.0+incompatible"},{"fixed":"10.12.4+incompatible","introduced":"10.12.0+incompatible"},{"fixed":"11.0.6+incompatible","introduced":"11.0.1+incompatible"},{"fixed":"11.1.1+incompatible","introduced":"11.1.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2025-13767"],"ecosystem":"Go","epss":0.00194,"exploited":false,"fixed_versions":["10.11.8+incompatible","10.12.4+incompatible","11.0.6+incompatible","11.1.1+incompatible"],"ghsa_id":"GHSA-fmqf-pmcm-8cx9","id":"tcs_01M5KGCPTEVA1Z4JP1811CMA0N","modified_at":"2026-02-26T17:42:02.028435Z","published_at":"2026-02-26T16:27:46Z","references":["https://osv.dev/vulnerability/GO-2025-4259","https://github.com/advisories/GHSA-fmqf-pmcm-8cx9","https://nvd.nist.gov/vuln/detail/CVE-2025-13767","https://github.com/mattermost/mattermost/commit/b57c297c6d7ae6812d85e32a625806ac9555deee","https://github.com/mattermost/mattermost/pull/34551","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2025-4259","url":"https://osv.dev/vulnerability/GO-2025-4259"},{"source":"nvd","source_id":"CVE-2025-13767","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-13767"}],"summary":"Mattermost doesn't validate user channel membership when attaching Mattermost posts as comments to Jira issues in github.com/mattermost/mattermost-server"}