{"id":"CVE-2026-28736","revision":"c92f7edd390f43e69a9ff1aef6ed93bd","records":[{"revision":"c92f7edd390f43e69a9ff1aef6ed93bd","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-28736","aliases":[],"title":"Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)","description":"** UNSUPPORTED WHEN ASSIGNED ** Focalboard version 8.0 fails to validate file ownership when serving uploaded files. This allows an authenticated attacker who knows a victim's fileID to read the content of the file. NOTE: Focalboard as a standalone product is not maintained and no fix will be issued.","state":0,"publishedAt":"2026-04-03T13:25:53.399+00:00","modifiedAt":"2026-04-03T14:54:37.869+00:00","affected":[{"ecosystem":"Vendor product","name":"Focalboard","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"product\": \"Focalboard\",\n                    \"vendor\": \"Mattermost\",\n                    \"versions\": [\n                        {\n                            \"lessThanOrEqual\": \"8.0\",\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3,"severity":"MEDIUM"}],"references":["https://github.com/mattermost-community/focalboard"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-28736","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-28736","identifiers":["CVE-2026-28736"]},"retained":false,"historicalAffected":[]}],"coverage":[]}