CVE-2026-90977: Unknown Clean Login

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The Clean Login WordPress plugin before 1.19 does not verify its registration CAPTCHA when the stored session value is empty, allowing unauthenticated users to bypass the anti-automation control on the registration form and create accounts without solving it.

Affected products

• Unknown Clean Login: before 1.19 (fixed in 1.19)

Published 2026-09-18. Last modified 2026-09-18.