CVE-2026-9273: Membership Plugin – Kadence Memberships <= 4.0.0 - Unauthenticated Password Reset Link Poisoning to Account Takeover

The Membership Plugin – Kadence Memberships plugin for WordPress (formerly Restrict Content) is vulnerable to password reset link poisoning leading to account takeover in all versions up to, and including, 4.0.0. This is due to the legacy lost-password handler rcprocesslostpasswordform() consuming the attacker-controlled rcredirect POST parameter into two unvalidated sinks in legacy/includes/forms.php: wpredirect( escurl( $POST['rcredirect'] ) . ... ) at line 243, and addqueryarg( array( 'key' => $key, 'login' => ... ), $POST['rcredirect'] ) inside rcsendpasswordresetemail() at line 306. The nonce required to reach the handler is broadcast by the public [loginform] shortcode at line 207 to any anonymous visitor. This makes it possible for unauthenticated attackers to issue a password-reset request for any account (including administrators) whose reset email body points the victim at an attacker-controlled host carrying a valid reset key/login. When the victim clicks the link, the reset key leaks to the attacker, who can replay it against the legitimate site to complete account takeover.