CVE-2026-16940: Unknown Custom Fields

Critical severity, CVSS 10.0. EPSS: 0.6% chance of exploitation in the next 30 days.

The Custom Fields WordPress plugin before 1.5.1 does not validate a user-supplied file path before deletion, allowing unauthenticated users to delete arbitrary files on the server (such as wp-config.php), which can lead to a full site takeover.

Affected products

• Unknown Custom Fields: before 1.5.1 (fixed in 1.5.1)

Published 2026-08-05. Last modified 2026-08-26.