{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260220133927-c29cf05d40f8 or later.","affected":[{"fixed":"8.0.0-20260220133927-c29cf05d40f8","introduced":"8.0.0-20250721062209-4952acea88ce"},{"fixed":"11.5.0","introduced":"11.5.0-rc1"},{"fixed":"11.4.3","introduced":"11.4.0-rc1"},{"fixed":"11.3.3","introduced":"11.3.0-rc1"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-28741"],"ecosystem":"Go","epss":0.00129,"exploited":false,"fixed_versions":["8.0.0-20260220133927-c29cf05d40f8","11.5.0","11.4.3","11.3.3"],"ghsa_id":"GHSA-m7cf-4gh2-v4qg","id":"tcs_01M5KFFFASV5D5KQPQJ5RSF8T9","modified_at":"2026-06-25T23:11:25.019451459Z","published_at":"2026-04-17T15:31:17Z","references":["https://osv.dev/vulnerability/GHSA-m7cf-4gh2-v4qg","https://nvd.nist.gov/vuln/detail/CVE-2026-28741","https://github.com/mattermost/mattermost","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":6.8},"sources":[{"source":"osv","source_id":"GHSA-m7cf-4gh2-v4qg","url":"https://osv.dev/vulnerability/GHSA-m7cf-4gh2-v4qg"}],"summary":"Mattermost doesn't validate CSRF tokens on an authentication endpoint"}