Vulnerabilidad · Publicado 05/09/2026
El plugin Contact Form by Supsystic (versiones hasta 1.10.2) contiene una vulnerabilidad de Cross-Site Scripting (XSS) almacenado que permite a atacantes no autenticados inyectar código malicioso a través del encabezado de dirección IP. Esto afecta a miles de sitios WordPress en LATAM que usan este plugin, exponiendo datos de usuarios y permitiendo comprometer la integridad de formularios de contacto. La vulnerabilidad tiene CVSS 7.2, indicando riesgo alto para empresas que recopilan información sensible a través de estos formularios.
The Contact Form by Supsystic plugin for WordPress is vulnerable to Stored Cross-Site Scripting via IP Address Header in all versions up to, and including, 1.10.2 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. An unauthenticated attacker can first call the 'updateNonce' action — which is accessible without authentication due to its absence from the plugin's permission list — to obtain a valid nonce, then submit a contact form with a malicious payload in a spoofed IP header such as X-Forwarded-For.
Score: 7.2/10 — Severidad: HIGH — Estado NIST: Received
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CWE-79
Publicado en NIST NVD.