{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260325191733-fb11968f8798 or later.","affected":[{"fixed":"11.5.2","introduced":"11.5.0"},{"fixed":"10.11.14","introduced":"10.11.0"},{"fixed":"11.4.4","introduced":"11.4.0"},{"fixed":"8.0.0-20260325191733-fb11968f8798","introduced":"0"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-6340"],"ecosystem":"Go","epss":0.0024,"exploited":false,"fixed_versions":["11.5.2","10.11.14","11.4.4","8.0.0-20260325191733-fb11968f8798"],"ghsa_id":"GHSA-cjm8-jxpw-g43m","id":"tcs_01M5KF7EVR192DXZD0R22C1PNW","modified_at":"2026-06-25T19:56:01.421462781Z","published_at":"2026-05-18T09:31:47Z","references":["https://osv.dev/vulnerability/GHSA-cjm8-jxpw-g43m","https://nvd.nist.gov/vuln/detail/CVE-2026-6340","https://github.com/mattermost/mattermost/commit/fb11968f8798925c7b75711025bc5f991124ba26","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-cjm8-jxpw-g43m","url":"https://osv.dev/vulnerability/GHSA-cjm8-jxpw-g43m"}],"summary":"Mattermost doesn't validate 7zip archive structure before processing"}