{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.14+incompatible or later.","affected":[{"fixed":"10.11.14+incompatible","introduced":"10.11.0+incompatible"},{"fixed":"11.4.4+incompatible","introduced":"11.4.0+incompatible"},{"fixed":"11.5.2+incompatible","introduced":"11.5.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-6340"],"ecosystem":"Go","epss":0.0024,"exploited":false,"fixed_versions":["10.11.14+incompatible","11.4.4+incompatible","11.5.2+incompatible"],"ghsa_id":"GHSA-cjm8-jxpw-g43m","id":"tcs_01M5KGKGJ4WD17582AVE0B3GVW","modified_at":"2026-06-25T19:45:28.843452652Z","published_at":"2026-06-25T18:43:19Z","references":["https://osv.dev/vulnerability/GO-2026-5325","https://github.com/advisories/GHSA-cjm8-jxpw-g43m","https://nvd.nist.gov/vuln/detail/CVE-2026-6340","https://github.com/mattermost/mattermost/commit/fb11968f8798925c7b75711025bc5f991124ba26","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":6.5},"sources":[{"source":"osv","source_id":"GO-2026-5325","url":"https://osv.dev/vulnerability/GO-2026-5325"},{"source":"nvd","source_id":"CVE-2026-6340","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6340"}],"summary":"Mattermost doesn't validate 7zip archive structure before processing in github.com/mattermost/mattermost-server"}