Vulnerability Details CVE-2026-28736
** 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.0%
CVSS Severity
CVSS v3 Score 4.3
Products affected by CVE-2026-28736
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cpe:2.3:a:mattermost:focalboard:8.0.0