Storybook dev server: devices on the same network can obtain the WebSocket token and write code into story files

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-114126
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-21 18:17:25 UTC
Updated2026-10-21 18:17:25 UTC
DescriptionStorybook 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.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

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/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

Problem Types: CWE-22 | CWE-94 | CWE-306 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-94 CWE-94: Improper Control of Generation of Code ('Code Injection') | CWE-306 CWE-306: Missing Authentication for Critical Function

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/C...
4.0CNADECLARED8.7HIGHCVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N

CVSS v4.0 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
None

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/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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Storybookjs Storybook affected >= 8.0.0, < 8.6.19 Not specified
CNA Storybookjs Storybook affected >= 9.0.0, < 9.1.21 Not specified
CNA Storybookjs Storybook affected >= 10.0.0, < 10.6.2 Not specified
CNA Storybookjs Storybook affected >= 11.0.0-alpha.0, < 11.0.0-alpha.6 Not specified

References

ReferenceSourceLinkTags
github.com/storybookjs/storybook/commit/df3fed468c9b4830605f00068c4bc6b7... [email protected] github.com
github.com/storybookjs/storybook/security/advisories/GHSA-px85-f4q5-jh77 [email protected] github.com
github.com/storybookjs/storybook/releases/tag/v8.6.19 [email protected] github.com
github.com/storybookjs/storybook/releases/tag/v11.0.0-alpha.6 [email protected] github.com
github.com/storybookjs/storybook/releases/tag/v10.6.2 [email protected] github.com
github.com/storybookjs/storybook/commit/a9ef9345d73224c73e0b81dc2701ec5b... [email protected] github.com
github.com/storybookjs/storybook/releases/tag/v9.1.21 [email protected] github.com
github.com/storybookjs/storybook/commit/5540f03b209cc56c66f56a9c7cb4b2ee... [email protected] github.com
github.com/storybookjs/storybook/commit/243c06bf8f1e2f09446c44868ea10026... [email protected] github.com
github.com/storybookjs/storybook/commit/3be03ec6f11f4616471cebc3fc65c13e... [email protected] github.com
github.com/storybookjs/storybook/pull/36726 [email protected] github.com
github.com/storybookjs/storybook/commit/d9b09e332510a88689c71ecc081bbbc2... [email protected] github.com
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