{"id":"GHSA-vph7-r229-qxpf","summary":"Focalboard doesn't validate file ownership when serving uploaded files","details":"** 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.","aliases":["CVE-2026-28736","GO-2026-5670"],"modified":"2026-06-25T23:11:25.767671289Z","published":"2026-04-03T15:30:31Z","database_specific":{"cwe_ids":["CWE-639"],"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2026-04-06T15:08:47Z","nvd_published_at":"2026-04-03T14:16:29Z"},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28736"},{"type":"PACKAGE","url":"https://github.com/mattermost-community/focalboard"}],"affected":[{"package":{"name":"github.com/mattermost/focalboard","ecosystem":"Go","purl":"pkg:golang/github.com/mattermost/focalboard"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"7.10.6"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-vph7-r229-qxpf/GHSA-vph7-r229-qxpf.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}