** 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.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 03 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 03 Apr 2026 14:00:00 +0000

Type Values Removed Values Added
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.
Title Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-04-03T14:54:37.869Z

Reserved: 2026-04-03T13:10:59.177Z

Link: CVE-2026-28736

cve-icon Vulnrichment

Updated: 2026-04-03T14:54:21.095Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-03T14:16:29.517

Modified: 2026-04-03T16:10:23.730

Link: CVE-2026-28736

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses