{"schema_version":"1.3.1","id":"GO-2026-5651","modified":"2026-06-25T22:34:38Z","published":"2026-06-25T22:34:38Z","aliases":["CVE-2026-3637","GHSA-v549-xx3c-6pc8"],"summary":"Mattermost doesn't check the create_post channel permission during post edit operations in github.com/mattermost/mattermost-server","details":"Mattermost doesn't check the create_post channel permission during post edit operations in github.com/mattermost/mattermost-server.\n\nNOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.\n\n(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)\n\nThe additional affected modules and versions are: github.com/mattermost/mattermost-server/v5 before v5.3.2-0.20260316171743-090408f09f53.","affected":[{"package":{"name":"github.com/mattermost/mattermost-server","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"10.11.0+incompatible"},{"fixed":"10.11.14+incompatible"},{"introduced":"11.4.0+incompatible"},{"fixed":"11.4.4+incompatible"},{"introduced":"11.5.0+incompatible"},{"fixed":"11.5.2+incompatible"}]}],"ecosystem_specific":{}},{"package":{"name":"github.com/mattermost/mattermost-server/v5","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"ecosystem_specific":{"custom_ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.3.2-0.20260316171743-090408f09f53"}]}]}},{"package":{"name":"github.com/mattermost/mattermost-server/v6","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"ecosystem_specific":{}},{"package":{"name":"github.com/mattermost/mattermost/server/v8","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"8.0.0-20260316171743-090408f09f53"}]}],"ecosystem_specific":{}}],"references":[{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-v549-xx3c-6pc8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3637"},{"type":"WEB","url":"https://github.com/mattermost/mattermost/commit/090408f09f53ffc9afc6c65c7c7c1fd3a8cd22f3"},{"type":"WEB","url":"https://mattermost.com/security-updates"}],"database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-5651","review_status":"UNREVIEWED"}}