{"id":"GO-2026-5769","revision":"2740ab8e0f524fff99fef59aadd7115e","records":[{"revision":"2740ab8e0f524fff99fef59aadd7115e","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5769","aliases":["CVE-2026-6339","GHSA-xvcx-mgpc-5xh3"],"title":"Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint in github.com/mattermost/mattermost-server","description":"Mattermost doesn't validate the X-Requested-With header on the burn-on-read reveal endpoint 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 v5.3.2-0.20260327001745-7a339a6438f5.","state":0,"publishedAt":"2026-06-25T22:34:41+00:00","modifiedAt":"2026-06-25T23:01:41.269315+00:00","affected":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"11.4.0+incompatible"},{"kind":"fixed","version":"11.4.4+incompatible"},{"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":"8.0.0-20260327001745-7a339a6438f5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/advisories/GHSA-xvcx-mgpc-5xh3","https://nvd.nist.gov/vuln/detail/CVE-2026-6339","https://github.com/mattermost/mattermost/commit/7a339a6438f5a4a5feba6b8de887f17a1378b207","https://mattermost.com/security-updates"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5769","license":"OSV · upstream source license applies","key":"osv:GO-2026-5769","identifiers":["GO-2026-5769","CVE-2026-6339","GHSA-xvcx-mgpc-5xh3"]},"retained":false,"historicalAffected":[]}],"coverage":[]}