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  4. CVE 2026 114125 storybook missing origin validation in storybook
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Back to active CVEs
High · CVSS 8.6CVE-2026-114125GHSA-F2PH-CMG5-WXC8

Storybook: Missing origin validation in Storybook preview allows code injection from malicious websitesCVE-2026-114125

Answer in brief

CVE-2026-114125 records a High severity (CVSS 8.6) vulnerability in Storybook: Missing origin validation in Storybook preview allows code injection from malicious websites. The current sources do not mark it as known exploited. The current feed maps storybookjs/storybook (generic), @storybook/addon-mcp (npm), @storybook/addon-mcp (npm), @storybook/addon-mcp (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 21, 2026Updated Oct 21, 2026Source checked Oct 21, 2026First seen by HOL Oct 21, 2026Material review Oct 21, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.6
Exploitation
Not marked as known exploited
Affected software
21 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps storybookjs/storybook (generic), @storybook/addon-mcp (npm), @storybook/addon-mcp (npm), @storybook/addon-mcp (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
storybookjs/storybookgeneric>=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.68.6.19, 9.1.21, 10.6.2, 11.0.0-alpha.6
@storybook/addon-mcpnpm>=10.6.0,<10.6.210.6.2
@storybook/addon-mcpnpm>=11.0.0-alpha.0,<11.0.0-alpha.611.0.0-alpha.6
@storybook/addon-mcpnpm>=10.6.0,<10.6.210.6.2
@storybook/addon-mcpnpm>=11.0.0-alpha.0,<11.0.0-alpha.611.0.0-alpha.6
@storybook/addon-vitestnpm>=9.0.0,<9.1.219.1.21
@storybook/addon-vitestnpm>=10.0.0,<10.6.210.6.2
@storybook/addon-vitestnpm>=11.0.0-alpha.0,<11.0.0-alpha.611.0.0-alpha.6
@storybook/addon-vitestnpm>=9.0.0,<9.1.219.1.21
@storybook/addon-vitestnpm>=10.0.0,<10.6.210.6.2
@storybook/addon-vitestnpm>=11.0.0-alpha.0,<11.0.0-alpha.611.0.0-alpha.6
@storybook/corenpm>=8.0.0,<8.6.198.6.19
@storybook/corenpm>=8.0.0,<8.6.198.6.19
@storybook/core-servernpm>=8.0.0,<8.6.198.6.19
@storybook/core-servernpm>=8.0.0,<8.6.198.6.19
@storybook/experimental-addon-testnpm>=8.0.0,<8.6.198.6.19
@storybook/experimental-addon-testnpm>=8.0.0,<8.6.198.6.19
storybooknpm>=8.0.0,<8.6.198.6.19
storybooknpm>=9.0.0,<9.1.219.1.21
storybooknpm>=10.0.0,<10.6.210.6.2
storybooknpm>=11.0.0-alpha.0,<11.0.0-alpha.611.0.0-alpha.6

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for storybookjs/storybook, @storybook/addon-mcp, @storybook/addon-mcp.
  2. 2Review the reported fix. Update storybookjs/storybook to 8.6.19; @storybook/addon-mcp to 10.6.2; @storybook/addon-mcp to 11.0.0-alpha.6; @storybook/addon-mcp to 10.6.2; @storybook/addon-mcp to 11.0.0-alpha.6; @storybook/addon-vitest to 9.1.21; @storybook/addon-vitest to 10.6.2; @storybook/addon-vitest to 11.0.0-alpha.6; @storybook/addon-vitest to 9.1.21; @storybook/addon-vitest to 10.6.2; @storybook/addon-vitest to 11.0.0-alpha.6; @storybook/core to 8.6.19; @storybook/core to 8.6.19; @storybook/core-server to 8.6.19; @storybook/core-server to 8.6.19; @storybook/experimental-addon-test to 8.6.19; @storybook/experimental-addon-test to 8.6.19; storybook to 8.6.19; storybook to 9.1.21; storybook to 10.6.2; storybook to 11.0.0-alpha.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 21, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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, a malicious website can interact with the preview of a running Storybook development server. Insufficient iframe embedding and message-origin restrictions can allow attacker-controlled events to reach the running preview. A developer must visit the malicious website and interact with the injected interface. The attack can cause unauthorized changes to story files and, if a changed file is later executed by a local runtime, arbitrary 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Storybook dev server: devices on the same network can obtain the WebSocket token and write code into story filesSame storybookjs/storybook package
  • Apache Pulsar: Missing Topic Authorization on Binary Protocol GetSchema and GetOrCreateSchema CommandsAlso CWE-862
  • Electron: openExternal permission requests can be attributed to the wrong originAlso CWE-346
  • WordPress eRoom plugin <= 1.7.1 - Broken Access Control vulnerabilityAlso CWE-862
  • gin-vue-admin through 2.9.2 Path Traversal via removePlugin EndpointAlso CWE-22
  • Cisco Expressway Series Software Hardening Release: October 2026 - Code Injection VulnerabilitiesAlso CWE-94

Record context

Vulnerability class
RCE
EPSS
Not reported
CWE IDs
CWE-94, CWE-346, CWE-1021, CWE-22, CWE-96, CWE-441, CWE-749, CWE-862
Source
CVE List V5
Source checked
Oct 21, 2026
References
13 linked sources
Open source record