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CVE-2026-34160

Estado: AnalizadaAlta (8.6)—

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the PENS (Package Exchange Notification Services) plugin endpoint at public/plugin/Pens/pens.php is accessible without authentication and accepts a user-controlled package-url parameter that the server fetches using curl without filtering private or internal IP addresses, enabling unauthenticated Server-Side Request Forgery (SSRF).

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An attacker can exploit this to probe internal network services, access cloud metadata endpoints (such as 169.254.169.254) to steal IAM credentials and sensitive instance metadata, or trigger state-changing operations on internal services via the receipt and alerts callback parameters. No authentication is required to exploit either SSRF vector, significantly increasing the attack surface. This issue has been fixed in version 2.0.0-RC.3.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Endpoint PENS expuesto sin autenticación (AV:N, PR:N, UI:N) permite SSRF contra metadatos internos y servicios cloud. Acceso a credenciales IAM y proxying de tráfico interno sin autenticación.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account ManagementLimit Access to Resource Over NetworkFilter Network TrafficApplication Developer GuidanceActive Directory ConfigurationVulnerability Scanning

Tecnologías afectadas (1)

Chamilo — Chamilo LMS

CWE

Referencias

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      "value": "Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the PENS (Package Exchange Notification Services) plugin endpoint at public/plugin/Pens/pens.php is accessible without authentication and accepts a user-controlled package-url parameter that the server fetches using curl without filtering private or internal IP addresses, enabling unauthenticated Server-Side Request Forgery (SSRF). An attacker can exploit this to probe internal network services, access cloud metadata endpoints (such as 169.254.169.254) to steal IAM credentials and sensitive instance metadata, or trigger state-changing operations on internal services via the receipt and alerts callback parameters. No authentication is required to exploit either SSRF vector, significantly increasing the attack surface. This issue has been fixed in version 2.0.0-RC.3."
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      "value": "Chamilo LMS es un sistema de gestión de aprendizaje de código abierto. En versiones anteriores a la 2.0.0-RC.3, el endpoint del plugin PENS (Package Exchange Notification Services) en public/plugin/Pens/pens.php es accesible sin autenticación y acepta un parámetro package-url controlado por el usuario que el servidor obtiene usando curl sin filtrar direcciones IP privadas o internas, lo que permite la falsificación de petición del lado del servidor (SSRF) no autenticada. Un atacante puede explotar esto para sondear servicios de red internos, acceder a endpoints de metadatos en la nube (como 169.254.169.254) para robar credenciales IAM y metadatos sensibles de la instancia, o activar operaciones que cambian el estado en servicios internos a través de los parámetros de callback de recibo y alertas. No se requiere autenticación para explotar cualquiera de los dos vectores de SSRF, lo que aumenta significativamente la superficie de ataque. Este problema ha sido solucionado en la versión 2.0.0-RC.3."
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  "lastModified": "2026-07-24T22:10:00.140",
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