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CVE-2026-27148

Estado: ModificadaAlta (8.9)—

Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook's dev server, used to create and update stories, is vulnerable to WebSocket hijacking. This vulnerability only affects the Storybook dev server; production builds are not impacted. Exploitation requires a developer to visit a malicious website while their local Storybook dev server is running.

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Because the WebSocket connection does not validate the origin of incoming connections, a malicious site can silently send WebSocket messages to the local instance without any further user interaction. If the Storybook dev server is intentionally exposed publicly (e.g. for design reviews or stakeholder demos) the risk is higher, as no malicious site visit is required. Any unauthenticated attacker can send WebSocket messages to it directly. The vulnerability affects the WebSocket message handlers for creating and saving stories. Both are vulnerable to injection via unsanitized input in the componentFilePath field, which can be exploited to achieve persistent XSS or Remote Code Execution (RCE). Versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10 contain a fix for the issue.

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 via WebSocket hijacking sin validación de origen (CWE-79); UI:A indica interacción del usuario (visita sitio malicioso). Inyección en componentFilePath permite persistencia y ejecución JavaScript en navegador del desarrollador.

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 TrainingRestrict File and Directory PermissionsRemote Data StorageExecution PreventionBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Storybook — Storybook

CWE

Referencias

JSON original (NVD)

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      "value": "Storybook is a frontend workshop for building user interface components and pages in isolation. Prior to versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10, the WebSocket functionality in Storybook's dev server, used to create and update stories, is vulnerable to WebSocket hijacking. This vulnerability only affects the Storybook dev server; production builds are not impacted. Exploitation requires a developer to visit a malicious website while their local Storybook dev server is running. Because the WebSocket connection does not validate the origin of incoming connections, a malicious site can silently send WebSocket messages to the local instance without any further user interaction. If the Storybook dev server is intentionally exposed publicly (e.g. for design reviews or stakeholder demos) the risk is higher, as no malicious site visit is required. Any unauthenticated attacker can send WebSocket messages to it directly. The vulnerability affects the WebSocket message handlers for creating and saving stories. Both are vulnerable to injection via unsanitized input in the componentFilePath field, which can be exploited to achieve persistent XSS or Remote Code Execution (RCE). Versions 7.6.23, 8.6.17, 9.1.19, and 10.2.10 contain a fix for the issue."
    },
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      "value": "Storybook es un taller de frontend para construir componentes de interfaz de usuario y páginas de forma aislada. Anteriormente a las versiones 7.6.23, 8.6.17, 9.1.19 y 10.2.10, la funcionalidad WebSocket en el servidor de desarrollo de Storybook, utilizada para crear y actualizar historias, es vulnerable a secuestro de WebSocket. Esta vulnerabilidad solo afecta al servidor de desarrollo de Storybook; las compilaciones de producción no se ven afectadas. La explotación requiere que un desarrollador visite un sitio web malicioso mientras su servidor de desarrollo local de Storybook está en ejecución. Debido a que la conexión WebSocket no valida el origen de las conexiones entrantes, un sitio malicioso puede enviar silenciosamente mensajes WebSocket a la instancia local sin ninguna interacción adicional del usuario. Si el servidor de desarrollo de Storybook se expone intencionalmente al público (por ejemplo, para revisiones de diseño o demostraciones a partes interesadas) el riesgo es mayor, ya que no se requiere la visita a un sitio malicioso. Cualquier atacante no autenticado puede enviarle mensajes WebSocket directamente. La vulnerabilidad afecta a los manejadores de mensajes WebSocket para crear y guardar historias. Ambos son vulnerables a la inyección a través de entrada no saneada en el campo componentFilePath, lo que puede ser explotado para lograr XSS persistente o Ejecución Remota de Código (RCE). Las versiones 7.6.23, 8.6.17, 9.1.19 y 10.2.10 contienen una solución para el problema."
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  "lastModified": "2026-07-15T02:19:06.850",
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