{"action":"Upgrade github.com/mattermost/mattermost-server to 10.11.18 or later.","affected":[{"fixed":"11.7.1","introduced":"11.7.0"},{"fixed":"11.6.3","introduced":"11.6.0"},{"fixed":"11.5.6","introduced":"11.5.0"},{"fixed":"10.11.18","introduced":"10.11.0"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-9162"],"ecosystem":"Go","epss":0.00334,"exploited":false,"fixed_versions":["11.7.1","11.6.3","11.5.6","10.11.18"],"ghsa_id":"GHSA-h998-hxxj-8q83","id":"tcs_01M5KFC8KD81HJFDZHX4193DD3","modified_at":"2026-09-28T17:11:23.936551637Z","published_at":"2026-06-22T15:30:46Z","references":["https://osv.dev/vulnerability/GHSA-h998-hxxj-8q83","https://nvd.nist.gov/vuln/detail/CVE-2026-9162","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GHSA-h998-hxxj-8q83","url":"https://osv.dev/vulnerability/GHSA-h998-hxxj-8q83"}],"summary":"Mattermost doesn't invalidate cached authentication state for active WebSocket connections during global session revocation"}