CVE-2026-16604: 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 outputs password-protected block content in the public page response before verifying the password, allowing unauthenticated users to recover the protected content without knowing the password.

Affected products

• Unknown Passster: before 4.3.6 (fixed in 4.3.6)

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