CVE-2025-30210

Estado: AnalizadaAlta (8.7)—

Bruno is an open source IDE for exploring and testing APIs. Prior to 1.39.1, the custom tool-tip components which internally use react-tooltip were setting the content (in this case the Environment name) as raw HTML which then gets injected into DOM on hover. This, combined with loose Content Security Policy restrictions, allowed any valid HTML text containing inline script to get executed on hovering over the respective Environment's name. This vulnerability's attack surface is limited strictly to scenarios where users import collections from untrusted or malicious sources.

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The exploit requires deliberate action from the user—specifically, downloading and opening an externally provided malicious Bruno or Postman collection export and the user hovers on the environment name. This vulnerability is fixed in 1.39.1.

CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 8.7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.35%
Percentil entre todas las CVEs puntuadas: 27
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1203 Exploitation for Client Executionexecution95 %
Impacto principalT1059.007 JavaScriptexecution90 %
Impacto secundarioT1005 Data from Local Systemcollection70 %

UI:A + interacción explícita (hover sobre nombre malicioso) → T1203. XSS inyectado en DOM ejecuta scripts JavaScript (T1059.007). Acceso a datos de la colección importada (T1005).

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 Content Execution Prevention Behavior Prevention on Endpoint Disable or Remove Feature or Program Application Isolation and Sandboxing Exploit Protection

Tecnologías afectadas (1)

Usebruno — Bruno

CWE

CWE-80

Referencias

https://github.com/usebruno/bruno/security/advisories/GHSA-fqxc-cxph-9vq8

JSON original (NVD)

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      "value": "Bruno es un IDE de código abierto para explorar y probar APIs. Antes de la versión 1.39.1, los componentes de descripciones emergentes personalizadas que usan internamente react-tooltip configuraban el contenido (en este caso, el nombre del entorno) como HTML sin formato, que se inyectaba en el DOM al pasar el cursor sobre el nombre del entorno. Esto, junto con restricciones flexibles de la Política de Seguridad de Contenido, permitía que cualquier texto HTML válido que contuviera scripts en línea se ejecutara al pasar el cursor sobre el nombre del entorno correspondiente. La superficie de ataque de esta vulnerabilidad se limita estrictamente a escenarios donde los usuarios importan colecciones de fuentes no confiables o maliciosas. El exploit requiere una acción deliberada del usuario específicamente, descargar y abrir una exportación de colección maliciosa de Bruno o Postman proporcionada externamente y pasar el cursor sobre el nombre del entorno. Esta vulnerabilidad se corrigió en la versión 1.39.1.\n\n"
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