{"action":"Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260316171743-090408f09f53 or later.","affected":[{"fixed":"8.0.0-20260316171743-090408f09f53","introduced":"0"}],"component":"github.com/mattermost/mattermost/server/v8","cve_ids":["CVE-2026-3637"],"ecosystem":"Go","epss":0.00152,"exploited":false,"fixed_versions":["8.0.0-20260316171743-090408f09f53"],"ghsa_id":"GHSA-v549-xx3c-6pc8","id":"tcs_01M5KGNXEWACFQ1F3VVQ0E1NZ8","modified_at":"2026-06-25T23:01:37.454131782Z","published_at":"2026-06-25T22:34:38Z","references":["https://osv.dev/vulnerability/GO-2026-5651","https://github.com/advisories/GHSA-v549-xx3c-6pc8","https://nvd.nist.gov/vuln/detail/CVE-2026-3637","https://github.com/mattermost/mattermost/commit/090408f09f53ffc9afc6c65c7c7c1fd3a8cd22f3","https://mattermost.com/security-updates"],"severity":{"label":"medium","score":4.3},"sources":[{"source":"osv","source_id":"GO-2026-5651#Go/github.com/mattermost/mattermost/server/v8","url":"https://osv.dev/vulnerability/GO-2026-5651"},{"source":"nvd","source_id":"CVE-2026-3637","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3637"}],"summary":"Mattermost doesn't check the create_post channel permission during post edit operations in github.com/mattermost/mattermost-server"}