Storybook vulnerabilities

A vulnerability in Storybook allows WebSocket hijacking in the dev server due to missing origin validation. Attackers can send malicious WebSocket messages, leading to persistent XSS or Remote Code Execution (RCE). Only the dev server is affected, not production builds.

Storybook from 8.0.0 until 8.6.19, 9.1.21, 10.6.2, and 11.0.0-alpha.6 allows the development server to expose its WebSocket authentication token to clients able to load its HTML pages over a local network. A LAN attacker can obtain the token and invoke WebSocket-backed file-writing or testing functionality. Weak story-write validation can allow code to be placed in story files, and with the Vitest addon, the payload can use a Vitest API to write files or execute commands, leading to code execution with developer privileges.

Storybook is a frontend workshop for building UI components and pages in isolation. From 8.0.0 until 8.6.19, 9.1.21, 10.6.2, and 11.0.0-alpha.6, a malicious website can interact with the preview of a running Storybook development server due to insufficient iframe embedding and message-origin restrictions. A developer must visit the malicious website and interact with the injected interface.