Executive brief
Clean Login is a WordPress plugin that manages user registration and authentication. The plugin fails to enforce the site administrator's setting to disable user registration, allowing attackers to bypass this control and create new user accounts even when registration is explicitly disabled. This could lead to unauthorized account creation and potential account takeover if weak credentials are used.
Technical details
The vulnerability is an access control bypass in the plugin's registration handler. The vulnerable component fails to check the WordPress site setting that controls whether user registration is enabled (wp_site_allows_registration check) before processing account creation requests. An unauthenticated attacker can send a direct registration request to bypass this check and create a new account on the target site. No authentication or special privileges are required; the attack is performed entirely over the network via HTTP POST to the registration endpoint. The vulnerability has been patched in version 1.19.
Affected products
- Clean Login Clean Login before 1.19
Timeline
- 2026-09-16: disclosed
- 2026-09-18: advisory: Published to NVD
- 2026-09-19: patched: Fixed in version 1.19