Vulnerability · Published Oct 21, 2026 · Assigned by GitHub_M
CVE-2026-114126Storybook dev server: devices on the same network can obtain the WebSocket token and write code into story files
High 8.7
In plain English
A high-severity path traversal in storybook from storybookjs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @storybook/addon-mcp | 10.6.2 | GHSA-px85-f4q5-jh77 |
| npm | @storybook/addon-mcp | 11.0.0-alpha.6 | GHSA-px85-f4q5-jh77 |
| npm | @storybook/addon-vitest | 11.0.0-alpha.6 | GHSA-px85-f4q5-jh77 |
| npm | @storybook/addon-vitest | 9.1.21 | GHSA-px85-f4q5-jh77 |
| npm | @storybook/addon-vitest | 10.6.2 | GHSA-px85-f4q5-jh77 |
| npm | @storybook/core | 8.6.19 | GHSA-px85-f4q5-jh77 |
| npm | @storybook/core-server | 8.6.19 | GHSA-px85-f4q5-jh77 |
| npm | @storybook/experimental-addon-test | 8.6.19 | GHSA-px85-f4q5-jh77 |
| npm | storybook | 8.6.19 | GHSA-px85-f4q5-jh77 |
| npm | storybook | 11.0.0-alpha.6 | GHSA-px85-f4q5-jh77 |
| npm | storybook | 10.6.2 | GHSA-px85-f4q5-jh77 |
| npm | storybook | 9.1.21 | GHSA-px85-f4q5-jh77 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| storybookjs | storybook | >= 8.0.0, < 8.6.19>= 9.0.0, < 9.1.21>= 10.0.0, < 10.6.2>= 11.0.0-alpha.0, < 11.0.0-alpha.6 |
Weakness: CWE-22, CWE-94, CWE-306 · Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N
References
- https://github.com/storybookjs/storybook/security/advisories/GHSA-px85-f4q5-jh77 x_refsource_CONFIRM
- https://github.com/storybookjs/storybook/pull/36726 x_refsource_MISC
- https://github.com/storybookjs/storybook/commit/243c06bf8f1e2f09446c44868ea100261e1374da x_refsource_MISC
- https://github.com/storybookjs/storybook/commit/3be03ec6f11f4616471cebc3fc65c13e1bf8c178 x_refsource_MISC
- https://github.com/storybookjs/storybook/commit/5540f03b209cc56c66f56a9c7cb4b2ee5b883ce5 x_refsource_MISC
- https://github.com/storybookjs/storybook/commit/a9ef9345d73224c73e0b81dc2701ec5b465ea9bb x_refsource_MISC
- https://github.com/storybookjs/storybook/commit/d9b09e332510a88689c71ecc081bbbc2d072476e x_refsource_MISC
- https://github.com/storybookjs/storybook/commit/df3fed468c9b4830605f00068c4bc6b7e1e215ed x_refsource_MISC
- https://github.com/storybookjs/storybook/releases/tag/v10.6.2 x_refsource_MISC
- https://github.com/storybookjs/storybook/releases/tag/v11.0.0-alpha.6 x_refsource_MISC
- https://github.com/storybookjs/storybook/releases/tag/v8.6.19 x_refsource_MISC
- https://github.com/storybookjs/storybook/releases/tag/v9.1.21 x_refsource_MISC