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CVE-2023-33962

Estado: ModificadaMedia (6.1)—💥 PoC

JStachio es un motor de plantillas Mustache para Java con seguridad de tipos. Antes de la versión 1.0.1, JStachio no escapa las comillas simples `'` en HTML, lo que permite a un atacante inyectar código malicioso. Un atacante puede aprovechar esta vulnerabilidad para ejecutar código JavaScript arbitrario en el contexto de otros usuarios que visiten páginas que utilicen este motor de plantillas. Esto puede tener diversas consecuencias, como el secuestro de sesiones, la desfiguración de páginas web, el robo de información sensible o incluso la propagación de malware.

La versión 1.0.1 contiene un parche para este problema. Para mitigar esta vulnerabilidad, el motor de plantillas debe escapar adecuadamente los caracteres especiales, incluidas las comillas simples.

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La práctica habitual consiste en escapar `'` como `&#39`. Como solución alternativa, los usuarios pueden evitar este problema utilizando únicamente comillas dobles `"` para los atributos HTML.

Traducción automática del texto original de NVD (en inglés).

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).

💥 Exploits públicos

Hay código de explotación o plantillas de detección públicos. No es lo mismo que explotación activa confirmada (KEV), pero aumenta el riesgo: parchee con prioridad.

⚠️ Las pruebas de concepto de GitHub no están verificadas: algunas son falsas o contienen malware. No las ejecute nunca fuera de un laboratorio aislado.

Tecnologías afectadas (1)

Jstachio Project — Jstachio

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2023-33962",
  "cveTags": [],
  "metrics": {
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      "value": "JStachio is a  type-safe Java Mustache templating engine. Prior to version 1.0.1, JStachio fails to escape single quotes `'` in HTML, allowing an attacker to inject malicious code. This vulnerability can be exploited by an attacker to execute arbitrary JavaScript code in the context of other users visiting pages that use this template engine. This can lead to various consequences, including session hijacking, defacement of web pages, theft of sensitive information, or even the propagation of malware.\n\nVersion 1.0.1 contains a patch for this issue. To mitigate this vulnerability, the template engine should properly escape special characters, including single quotes. Common practice is to escape `'` as `&#39`. As a workaround, users can avoid this issue by using only double quotes `\"` for HTML attributes."
    }
  ],
  "lastModified": "2026-06-17T06:02:36.583",
  "configurations": [
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}