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CVE-2026-28736

nvd nist
Published: Apr 3, 2026Modified: Apr 28, 2026

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4.3
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Exploitability: 2.8 / Impact: 1.4
Source: responsibledisclosure@mattermost.com (Secondary)

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 (1)

Mattermost
1 product
Focalboard
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Focalboard
Version 8.0.0

Related CWEs

CWE-639
Authorization Bypass Through User-Controlled Key
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

References (1)

Source: responsibledisclosure@mattermost.com
Product

Timeline

No history available yet.