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Vulnerabilities

Security fix · CVE-2026-114125

Storybook: Missing origin validation in Storybook preview allows code injection from malicious websites

Published Oct 21, 2026 · catalog updated Oct 21, 2026 · Storybook: Missing origin validation

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-2026-114125. EPSS is 0.39%. Act only if a listed version of Storybook: Missing origin validation 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: Missing origin validation).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.39%
Remediation
Version ranges on file
Affected products
npm @storybook/addon-mcp · npm @storybook/addon-vitest · npm @storybook/core · npm @storybook/core-server · npm @storybook/experimental-addon-test · npm storybook

**Summary:** A malicious website may be able to cause unauthorized file changes in a developer’s project while an affected Storybook development server is running. Under additional conditions, a changed file could be executed by a local runtime with the developer’s privileges. We are not aware of exploitation in the wild. ## Who is impacted? You are impacted if you run a Storybook dev server in the affected versions. You are not impacted if: - You run a dev server that you never open in a web browser (e.g. headless automation, MCP clients) - You run or visit a built version of Storybook Recent versions of Chrome and Firefox may ask for permission before a website can connect to a service. This reduces the risk, but does not remove it. Do not grant this permission to websites you don’t trust. ## 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, we've added feature flags that can disable specific security updates to support your existing workflows. Please carefully read the introduced flags and the consequences of using them. #### Iframe embedding over the network is disabled by default Storybook no longer allows the manager or preview to be embedded as an iframe on a website with a different host name. Built versions of Storybook are unaffected and can be f

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 @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
  • vendor storybookjs storybookversion unspecified

How to fix CVE-2026-114125

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-2026-114125. EPSS is 0.39%. Act only if a listed version of Storybook: Missing origin validation 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-1021: Improper Restriction of Rendered UI Layers or Frames; CWE-22: Path Traversal; CWE-346. EPSS 0.39%. 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.

  1. Oct 21, 2026 · GitHub Advisory Database

    Detected

    **Summary:** A malicious website may be able to cause unauthorized file changes in a developer’s project while an affected Storybook development server is running. Under additional conditions, a changed file could be executed by a local runtime with the developer’s privileges. We are not aware of exploitation in the wild. ## Who is impacted? You are impacted if you run a Storybook dev server in th

  2. Oct 21, 2026 · GitHub Advisory Database

    Updated

    **Summary:** A malicious website may be able to cause unauthorized file changes in a developer’s project while an affected Storybook development server is running. Under additional conditions, a changed file could be executed by a local runtime with the developer’s privileges. We are not aware of exploitation in the wild. ## Who is impacted? You are impacted if you run a Storybook dev server in th

Sources

  • CVE.orgVulnerability recordCVE-2026-114125

    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, a malicious website can interact with the preview of a running Storybook development server. Insufficient iframe embedding

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-114125

    30-day exploitation probability 0.39%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-f2ph-cmg5-wxc8

    Storybook: Missing origin validation in Storybook preview allows code injection from malicious websites

    github.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
  • CVE.orgOct 23, 2026
  • GitHub Advisory DatabaseOct 22, 2026