{"id":"GO-2026-5263","revision":"7548b604858448f5baf134994a3e72fc","records":[{"revision":"7548b604858448f5baf134994a3e72fc","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5263","aliases":["CVE-2026-5163","GHSA-8r89-8w26-cq32"],"title":"Mattermost doesn't verify channel membership when processing AI-assisted message rewrites in github.com/mattermost/mattermost-server","description":"Mattermost doesn't verify channel membership when processing AI-assisted message rewrites 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 v5.3.2-0.20260401090745-f4d1abe7e8f5.","state":0,"publishedAt":"2026-06-25T18:43:15+00:00","modifiedAt":"2026-06-25T19:45:24.9159645+00:00","affected":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.5.0+incompatible"},{"kind":"fixed","version":"11.5.2+incompatible"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v5","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/mattermost/mattermost/server/v8","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"8.0.0-20260401090745-f4d1abe7e8f5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/advisories/GHSA-8r89-8w26-cq32","https://nvd.nist.gov/vuln/detail/CVE-2026-5163","https://github.com/mattermost/mattermost/commit/f4d1abe7e8f545f1a87f463fa9fe451c731aebf8","https://mattermost.com/security-updates"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5263","license":"OSV · upstream source license applies","key":"osv:GO-2026-5263","identifiers":["GO-2026-5263","CVE-2026-5163","GHSA-8r89-8w26-cq32"]},"retained":false,"historicalAffected":[]}],"coverage":[]}