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CVE-2025-27088

Estado: AnalizadaAlta (8.4)—

oxyno-zeta/s3-proxy is an aws s3 proxy written in go. In affected versions a Reflected Cross-site Scripting (XSS) vulnerability enables attackers to create malicious URLs that, when visited, inject scripts into the web application. This can lead to session hijacking or phishing attacks on a trusted domain, posing a moderate risk to all users. It's possible to inject html elements, including scripts through the folder-list template.

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The affected template allows users to interact with the URL path provided by the `Request.URL.Path` variable, which is then rendered directly into the HTML without proper sanitization or escaping. This can be abused by attackers who craft a malicious URL containing injected HTML or JavaScript. When users visit such a URL, the malicious script will be executed in the user's context. This issue has been addressed in version 4.18.1 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

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.

XSS reflejado (CWE-79) en URL sin sanitización: T1189. Inyección JavaScript en navegador (T1059.007) y robo de sesión/credenciales (T1012) vía scripts maliciosos en contexto de usuario de confianza.

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

Restrict Web-Based ContentUser TrainingExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or ProgramApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Oxyno-zeta — S3-proxy

CWE

Referencias

JSON original (NVD)

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      "value": "oxyno-zeta/s3-proxy is an aws s3 proxy written in go. In affected versions a Reflected Cross-site Scripting (XSS) vulnerability enables attackers to create malicious URLs that, when visited, inject scripts into the web application. This can lead to session hijacking or phishing attacks on a trusted domain, posing a moderate risk to all users. It's possible to inject html elements, including scripts through the folder-list template. The affected template allows users to interact with the URL path provided by the `Request.URL.Path` variable, which is then rendered directly into the HTML without proper sanitization or escaping. This can be abused by attackers who craft a malicious URL containing injected HTML or JavaScript. When users visit such a URL, the malicious script will be executed in the user's context. This issue has been addressed in version 4.18.1 and all users are advised to upgrade. There are no known workarounds for this vulnerability."
    },
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      "value": "oxyno-zeta/s3-proxy es un proxy de AWS S3 escrito en Go. En las versiones afectadas, una vulnerabilidad de Cross-site Scripting (XSS) reflejado permite a los atacantes crear URL maliciosas que, cuando se visitan, inyectan secuencias de comandos en la aplicación web. Esto puede provocar secuestros de sesión o ataques de phishing en un dominio de confianza, lo que supone un riesgo moderado para todos los usuarios. Es posible inyectar elementos HTML, incluidas secuencias de comandos, a través de la plantilla de lista de carpetas. La plantilla afectada permite a los usuarios interactuar con la ruta de URL proporcionada por la variable `Request.URL.Path`, que luego se representa directamente en el HTML sin la depuración o el escape adecuados. Los atacantes pueden abusar de esto y manipular una URL maliciosa que contenga HTML o JavaScript inyectado. Cuando los usuarios visitan una URL de este tipo, la secuencia de comandos maliciosa se ejecutará en el contexto del usuario. Este problema se ha solucionado en la versión 4.18.1 y se recomienda a todos los usuarios que actualicen. No existen workarounds para esta vulnerabilidad."
    }
  ],
  "lastModified": "2026-06-17T09:03:00.583",
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