Security fix · CVE-2026-114126

Storybook dev server vulnerable to code injection from the local network

Q: Which versions are affected?

Compare what you have installed with >= 10.6.0, = 11.0.0-alpha.0, = 10.0.0, = 9.0.0, = 8.0.0, < 8.6.19. Compare the installed version with the linked vendor advisory before you change production.

Q: What should an analyst verify?

CWE-1188; CWE-22: Path Traversal; CWE-306: Missing Authentication for Critical Function. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Published Oct 21, 2026 · catalog updated Oct 28, 2026 · Storybook dev server vulnerable

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-114126. EPSS is 0.53%. Act only if a listed version of Storybook dev server vulnerable is installed.

Gaps on this record

The stored product name is a package slug. The name on this page is taken from the title (Storybook dev server vulnerable).
No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity: High8.7
Known exploitation: Not in CISA/VulnCheck KEV
EPSS: 0.53%
Remediation: Version ranges on file
Affected products: npm @storybook · npm @storybook/addon-mcp · npm @storybook/addon-vitest · npm @storybook/core · npm @storybook/core-server · npm @storybook/experimental-addon-test

**Summary:** The Storybook dev server exposes its WebSocket authentication token to any client that can load its HTML pages. Any host on a LAN can open a Storybook app by IP address, and therefore obtain the token. The WebSocket can be used to inject code into story files or to create new files. Under the right circumstances, an attacker can execute code on the machine of a developer connected on the same LAN. ## Who is impacted? You are impacted if you run a Storybook dev server whilst connected on an untrusted local network, or to a WiFi access point posing as a trusted network. The impact of this advisory is more important if you have the Vitest addon installed and are using an old version of Vitest. You are not impacted if: - You run a dev server in an environment that other devices on your network cannot reach (e.g. a container that does not publish the Storybook port, or publishes it only on ) - You run a dev server whilst connected to a trusted local network - You serve a built version of Storybook on your machine ## Recommended actions ### Upgrade Storybook Storybook has released patched versions of all affected major Storybook versions that fix all the vulnerabilities necessary for the worst-case scenario above to occur. Upgrade to a patched version listed below before running again. If you cannot upgrade immediately, do not run an affected Storybook dev server until you can apply the fix. - 11.0.0-alpha.6 - 10.6.2 - 9.1.21 - 8.6.19 ### Review potentially breaking changes Due to the exceptional nature of the reported vulnerabilities, the Storybook team has decided to change the default behavior of Storybook, including versions 8 and 9, for several network-related features that are not essential to most Storybook users' workflow. If your team relies on the affected features, this document explains how to fall back to the previous behavior. #### Storybook now only listens on by default By default, the Storybook dev server no longer binds to all network interf

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

npm @storybookversion unspecified
npm @storybook/addon-mcp>= 10.6.0, < 10.6.2
npm @storybook/addon-mcp>= 11.0.0-alpha.0, < 11.0.0-alpha.6
npm @storybook/addon-vitest>= 10.0.0, < 10.6.2
npm @storybook/addon-vitest>= 11.0.0-alpha.0, < 11.0.0-alpha.6
npm @storybook/addon-vitest>= 9.0.0, < 9.1.21
npm @storybook/core>= 8.0.0, < 8.6.19
npm @storybook/core-server>= 8.0.0, < 8.6.19
npm @storybook/experimental-addon-test>= 8.0.0, < 8.6.19
npm storybook>= 10.0.0, < 10.6.2
npm storybook>= 11.0.0-alpha.0, < 11.0.0-alpha.6
npm storybook>= 8.0.0, < 8.6.19
npm storybook>= 9.0.0, < 9.1.21
package npmversion unspecified
vendor storybookjs storybookversion unspecified

How to fix CVE-2026-114126

Upgrade
CVE-2026-114126 lists a fix boundary at 10.6.2. Compare the installed build with that boundary before you change production.
Version check
Affected < 10.6.2
Advisory
Open the cve_org record and follow its fix.
Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-114126. EPSS is 0.53%. Act only if a listed version of Storybook dev server vulnerable is installed.

Which versions are affected?

Compare what you have installed with >= 10.6.0, < 10.6.2, >= 11.0.0-alpha.0, < 11.0.0-alpha.6, >= 10.0.0, < 10.6.2, >= 9.0.0, < 9.1.21, >= 8.0.0, < 8.6.19. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1188; CWE-22: Path Traversal; CWE-306: Missing Authentication for Critical Function. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

Oct 22, 2026 · GitHub Advisory Database
Detected
**Summary:** The Storybook dev server exposes its WebSocket authentication token to any client that can load its HTML pages. Any host on a LAN can open a Storybook app by IP address, and therefore obtain the token. The WebSocket can be used to inject code into story files or to create new files. Under the right circumstances, an attacker can execute code on the machine of a developer connected on
Oct 22, 2026 · GitHub Advisory Database
Updated
**Summary:** The Storybook dev server exposes its WebSocket authentication token to any client that can load its HTML pages. Any host on a LAN can open a Storybook app by IP address, and therefore obtain the token. The WebSocket can be used to inject code into story files or to create new files. Under the right circumstances, an attacker can execute code on the machine of a developer connected on
Oct 28, 2026 · NIST NVD
Updated
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.

Sources

CVE.orgVulnerability recordCVE-2026-114126
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
cve.org
FIRST EPSSExploitation probabilityCVE-2026-114126
30-day exploitation probability 0.53%
first.org
GitHub Advisory DatabasePackage advisoryGHSA-px85-f4q5-jh77
Storybook dev server vulnerable to code injection from the local network
github.com
GitLab Advisory DatabasePackage advisoryCVE-2026-114126
Summary: The Storybook dev server exposes its WebSocket authentication token to any client that can load its HTML pages. Any host on a LAN can open a Storybook app by IP address, and therefore obtain the token. The WebSocket can be used to inject code into story files or to create new files. Under the right circumstances, an attacker can execute code on the machine of a developer connected on …
advisories.gitlab.com
NIST NVDVulnerability recordCVE-2026-114126
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
nvd.nist.gov
Snyk Vulnerability DatabasePackage advisorySNYK-JS-STORYBOOK-21460714
Insecure Default Initialization of Resource
security.snyk.io
Snyk Vulnerability DatabasePackage advisorySNYK-JS-STORYBOOKADDONMCP-21460709
Insecure Default Initialization of Resource
security.snyk.io
Snyk Vulnerability DatabasePackage advisorySNYK-JS-STORYBOOKADDONVITEST-21460710
Insecure Default Initialization of Resource
security.snyk.io
Snyk Vulnerability DatabasePackage advisorySNYK-JS-STORYBOOKCORE-21460713
Insecure Default Initialization of Resource
security.snyk.io
Snyk Vulnerability DatabasePackage advisorySNYK-JS-STORYBOOKCORESERVER-21460712
Insecure Default Initialization of Resource
security.snyk.io
Snyk Vulnerability DatabasePackage advisorySNYK-JS-STORYBOOKEXPERIMENTALADDONTEST-21460711
Insecure Default Initialization of Resource
security.snyk.io
Tenable CVE DatabaseVulnerability recordCVE-2026-114126
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.
tenable.com

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

FIRST EPSSNov 3, 2026
Tenable CVE DatabaseOct 28, 2026
NIST NVDOct 28, 2026
Snyk Vulnerability DatabaseOct 26, 2026
Snyk Vulnerability DatabaseOct 26, 2026
Snyk Vulnerability DatabaseOct 26, 2026
Snyk Vulnerability DatabaseOct 26, 2026
Snyk Vulnerability DatabaseOct 26, 2026
Snyk Vulnerability DatabaseOct 26, 2026
GitHub Advisory DatabaseOct 23, 2026
GitLab Advisory DatabaseOct 23, 2026
CVE.orgOct 23, 2026

Priority score

14/100

Evidence confidence: High

Several independent sources name this vulnerability.

Confirmed exploitation0/30
EPSS probability1/20
CVSS severity13/15
Public exploit0/10
Internet exposure0/10
Product prevalence0/5
Detection0/5
Threat research0/5

Decision signals

Four separate signals — do not infer one from another.

High

CVSS severity
8.7 v4.0
Technical impact. Separate from exploitation likelihood.
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:
EPSS probability
0.53% · p44.47%
Estimated probability of exploitation within 30 days (FIRST).
Known exploitation
No verified KEV listing
Evidence from CISA KEV or VulnCheck KEV only — not from EPSS alone.
Patch availability
Version ranges on file
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.

Stacks

npm

Weakness

CWE-1188 MITRE definition
CWE-22
Path Traversal
MITRE definition
CWE-306
Missing Authentication for Critical Function
MITRE definition
CWE-94
Code Injection
MITRE definition

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