Vulnerabilidad · Publicado 17/10/2026
El plugin User Registration & Membership para WordPress es vulnerable a ejecución arbitraria de shortcodes en versiones hasta 5.2.8 debido a sanitización insuficiente del encabezado HTTP_REFERER en la función UR_Smart_Tags::process(). Un atacante puede inyectar shortcodes maliciosos explotando la validación deficiente, comprometiendo sitios WordPress con membresías y registros de usuarios. Afecta directamente a plataformas de e-learning, portales de suscripción y comunidades online comunes en LATAM.
The User Registration & Membership plugin for WordPress is vulnerable to Arbitrary Shortcode Execution in versions up to, and including, 5.2.8 This is due to insufficient input sanitization in the 'referrer_url' branch of UR_Smart_Tags::process(), where the attacker-controlled HTTP_REFERER header is only passed through sanitize_text_field() — which does not strip WordPress shortcode delimiters — before being substituted into a Content Restriction message that is subsequently executed via apply_shortcodes()/do_shortcode(). This makes it possible for unauthenticated attackers to execute arbitrary registered shortcodes on any restricted page whose message uses the supported {{referrer_url}} smart tag.
Score: 8.1/10 — Severidad: HIGH — Estado NIST: Received
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-94
Publicado en NIST NVD.