CVE-2026-28736 — Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)
** 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 f…
Published: 2026-04-03 · CVSS: 4.3 · CVSS 3.1
** 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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7