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CVE-2026-28736

MEDIUM CVSS: 4.3 Published: 2026-04-03 Modified: 2026-07-24

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.

Affected Platforms

Mattermost Focalboard

Weakness Type

CWE-639

References