{"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":"11.5.2+incompatible","introduced":"11.5.0+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-6334"],"ecosystem":"Go","epss":0.00118,"exploited":false,"fixed_versions":["10.11.14+incompatible","11.5.2+incompatible"],"ghsa_id":"GHSA-jp3f-x449-4q75","id":"tcs_01M5KGMHMV4GTWASGYD771FTEX","modified_at":"2026-06-25T23:00:17.667622181Z","published_at":"2026-06-25T22:34:31Z","references":["https://osv.dev/vulnerability/GO-2026-5474","https://github.com/advisories/GHSA-jp3f-x449-4q75","https://nvd.nist.gov/vuln/detail/CVE-2026-6334","https://github.com/mattermost/mattermost/commit/e9ae890a013bb57989fcbdb548d8b7b86b240237","https://mattermost.com/security-updates"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"GO-2026-5474","url":"https://osv.dev/vulnerability/GO-2026-5474"}],"summary":"Mattermost doesn't enforce client identity binding during the OAuth authorization code redemption flow in github.com/mattermost/mattermost-server"}