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CVE-2026-28736

Focalboard IDOR in file content endpoint allows cross-user file access (unsupported product, no fix)

** 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.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Mattermost
Products
Focalboard
CVE-2026-25773

Focalboard Second-Order SQL Injection in category reorder endpoint allows data exfiltration (unsupported product, no fix)

** UNSUPPORTED WHEN ASSIGNED ** Focalboard version 8.0 fails to sanitize category IDs before incorporating them into dynamic SQL statements when reordering categories. An attacker can inject a malicious SQL payload into the category id field, which is stored in the database and later executed unsanitized when the category reorder API processes the stored value. This Second-Order SQL Injection (Time-Based Blind) allows an authenticated attacker to exfiltrate sensitive data including password hashes of other users. NOTE: Focalboard as a standalone product is not maintained and no fix will be issued.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Mattermost
Products
Focalboard