CVE-2026-114126
CVE-2026-114126 updated by NVD
Summary
Storybook is a frontend workshop for building user interface 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, the Storybook development server can 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. If the Storybook Vitest addon is installed with an old version of Vitest, the payload can use a Vitest API to write additional files or execute commands. Depending on the payload and local tooling, the attack can lead to code execution with the developer's privileges. This issue is fixed in 8.6.19, 9.1.21, 10.6.2, and 11.0.0-alpha.6.
Affected packages
| Ecosystem | Package | Affected versions | Fixed versions |
|---|---|---|---|
| npm | @storybook/addon-mcp | — | 10.6.2, 11.0.0-alpha.6 |
| npm | @storybook/addon-vitest | — | 9.1.21, 10.6.2, 11.0.0-alpha.6 |
| npm | @storybook/core | — | 8.6.19 |
| npm | @storybook/core-server | — | 8.6.19 |
| npm | @storybook/experimental-addon-test | — | 8.6.19 |
| npm | storybook | — | 8.6.19, 9.1.21, 10.6.2, 11.0.0-alpha.6 |
Remediation: Upgrade to 10.6.2 or later.
References
Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.
Includes data from the National Vulnerability Database (NIST). NVD data is in the public domain; this page is not endorsed by NIST.
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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.