CVE-2026-16603: Unknown Passster

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

The Passster WordPress plugin before 4.3.6 does not enforce its category-based content protection on the WordPress REST API, allowing unauthenticated users to read the full content, title, and excerpt of category-locked posts through the core REST API.

Affected products

• Unknown Passster: before 4.3.6 (fixed in 4.3.6)

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