CVE-2026-28736

—

CVSS 3.1

4.3 medium

EPSS

<1%p13

Published

Apr 3, 2026 (Apr 3, 2026)

Modified

Jul 24, 2026

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.

Vendors: mattermost
Products: focalboard
Weakness: CWE-639
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

NVD CVE.org GitHub PoCs EPSS (0.2%)

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