{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.15 or later.","affected":[{"fixed":"11.6.1","introduced":"11.6.0"},{"fixed":"11.5.4","introduced":"11.5.0"},{"fixed":"11.4.5","introduced":"11.4.0"},{"fixed":"10.11.15","introduced":"10.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-4635"],"ecosystem":"Go","epss":0.00172,"exploited":false,"fixed_versions":["11.6.1","11.5.4","11.4.5","10.11.15"],"ghsa_id":"GHSA-pg7c-462j-grxv","id":"tcs_01M5KFHC1XBXWXN9AGC4BW86P2","modified_at":"2026-07-07T16:11:32.973521518Z","published_at":"2026-05-26T13:30:15Z","references":["https://osv.dev/vulnerability/GHSA-pg7c-462j-grxv","https://nvd.nist.gov/vuln/detail/CVE-2026-4635","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-pg7c-462j-grxv","url":"https://osv.dev/vulnerability/GHSA-pg7c-462j-grxv"}],"summary":"Mattermost doesn't archive the channel before removing persistent notifications"}