{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.15+incompatible or later.","affected":[{"fixed":"10.11.15+incompatible","introduced":"10.11.0+incompatible"},{"fixed":"11.4.5+incompatible","introduced":"11.4.0+incompatible"},{"fixed":"11.5.4+incompatible","introduced":"11.5.0+incompatible"},{"fixed":"11.6.1+incompatible","introduced":"11.6.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-4635"],"ecosystem":"Go","epss":0.00172,"exploited":false,"fixed_versions":["10.11.15+incompatible","11.4.5+incompatible","11.5.4+incompatible","11.6.1+incompatible"],"ghsa_id":"GHSA-pg7c-462j-grxv","id":"tcs_01M5KGQ2R713N7DJY9SYRZ2YH1","modified_at":"2026-07-07T16:01:34.910029874Z","published_at":"2026-07-07T15:26:32Z","references":["https://osv.dev/vulnerability/GO-2026-5820","https://github.com/advisories/GHSA-pg7c-462j-grxv","https://nvd.nist.gov/vuln/detail/CVE-2026-4635","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GO-2026-5820","url":"https://osv.dev/vulnerability/GO-2026-5820"},{"source":"nvd","source_id":"CVE-2026-4635","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4635"}],"summary":"Mattermost doesn't archive the channel before removing persistent notifications in github.com/mattermost/mattermost-server"}