{"action":"Upgrade github.com/mattermost/mattermost-server to 11.3.3+incompatible or later.","affected":[{"fixed":"11.3.3+incompatible","introduced":"11.3.0-rc1+incompatible"},{"fixed":"11.4.3+incompatible","introduced":"11.4.0-rc1+incompatible"},{"fixed":"11.5.0+incompatible","introduced":"11.5.0-rc1+incompatible"}],"component":"github.com/mattermost/mattermost-server","cve_ids":["CVE-2026-28741"],"ecosystem":"Go","epss":0.00129,"exploited":false,"fixed_versions":["11.3.3+incompatible","11.4.3+incompatible","11.5.0+incompatible"],"ghsa_id":"GHSA-m7cf-4gh2-v4qg","id":"tcs_01M5KGMR2PJZ7HDT9KFSS3RRC6","modified_at":"2026-06-25T23:01:18.246988261Z","published_at":"2026-06-25T22:34:31Z","references":["https://osv.dev/vulnerability/GO-2026-5495","https://github.com/advisories/GHSA-m7cf-4gh2-v4qg","https://nvd.nist.gov/vuln/detail/CVE-2026-28741","https://mattermost.com/security-updates"],"severity":{"label":"high","score":8.1},"sources":[{"source":"osv","source_id":"GO-2026-5495","url":"https://osv.dev/vulnerability/GO-2026-5495"},{"source":"nvd","source_id":"CVE-2026-28741","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28741"}],"summary":"Mattermost doesn't validate CSRF tokens on an authentication endpoint in github.com/mattermost/mattermost-server"}