mattermost-community/focalboard · Security
Focalboard doesn't validate file ownership when serving uploaded files
- GHSA ID
- GHSA-vph7-r229-qxpf
- CVE ID
- CVE-2026-28736
- Severity
- medium
- Published
- Updated
- CVSS
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CVSS v3
- 4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
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.
CWEs
- CWE-639 · Authorization Bypass Through User-Controlled Key