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CVE-2026-23737

Estado: AnalizadaAlta (7.5)—

seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution. Exploitation is possible via overriding constant value and error deserialization, allowing indirect access to unsafe JS evaluation. At minimum, attackers need the ability to perform 4 separate requests on the same function, and partial knowledge of how the serialized data is used during later runtime processing. This vulnerability affects the fromJSON and fromCrossJSON functions in a client-to-server transmission scenario. This issue has been fixed in version 1.4.0.

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.

Acceso a red con PR:L; requiere múltiples requests pero no interacción. Impacto: ejecución de código JS vía deserialización insegura (CWE-502).

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 ManagementDisable or Remove Feature or ProgramVulnerability ScanningThreat Intelligence ProgramRestrict Web-Based ContentNetwork Segmentation

Tecnologías afectadas (1)

Lxsmnsyc — Seroval

CWE

Referencias

JSON original (NVD)

Mostrar
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          "version": "2.0.3",
          "timestamp": "2026-01-22T21:54:58.352664Z"
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  "published": "2026-01-21T23:15:52.493",
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      "value": "seroval facilitates JS value stringification, including complex structures beyond JSON.stringify capabilities. In versions 1.4.0 and below, improper input handling in the JSON deserialization component can lead to arbitrary JavaScript code execution. Exploitation is possible via overriding constant value and error deserialization, allowing indirect access to unsafe JS evaluation. At minimum, attackers need the ability to perform 4 separate requests on the same function, and partial knowledge of how the serialized data is used during later runtime processing. This vulnerability affects the fromJSON and fromCrossJSON functions in a client-to-server transmission scenario. This issue has been fixed in version 1.4.0."
    },
    {
      "lang": "es",
      "value": "seroval facilita la serialización de valores JS, incluyendo estructuras complejas más allá de las capacidades de JSON.stringify. En las versiones 1.4.0 e inferiores, un manejo inadecuado de la entrada en el componente de deserialización JSON puede llevar a la ejecución arbitraria de código JavaScript. Es posible explotarlo mediante la anulación de la deserialización de valores constantes y errores, permitiendo el acceso indirecto a la evaluación JS insegura. Como mínimo, los atacantes necesitan la capacidad de realizar 4 solicitudes separadas en la misma función, y un conocimiento parcial de cómo se utilizan los datos serializados durante el procesamiento posterior en tiempo de ejecución. Esta vulnerabilidad afecta a las funciones fromJSON y fromCrossJSON en un escenario de transmisión de cliente a servidor. Este problema ha sido solucionado en la versión 1.4.0."
    }
  ],
  "lastModified": "2026-06-17T10:22:01.340",
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