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Fencer Intel
high 8.6

CVE-2026-114125 json

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

published 19d ago modified 12d ago also EUVD-2026-107393 , GHSA-f2ph-cmg5-wxc8

cvss
8.6
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm storybook 8.6.19, 9.1.21, 10.6.2, 11.0.0-alpha.6
  • npm @storybook/core 8.6.19
  • npm @storybook/core-server 8.6.19
  • npm @storybook/experimental-addon-test 8.6.19
  • npm @storybook/addon-vitest 9.1.21, 10.6.2, 11.0.0-alpha.6
  • npm @storybook/addon-mcp 10.6.2, 11.0.0-alpha.6
  • storybook storybook 8.6.19, 9.1.21, 10.6.2, 11.0.0-alpha.6

Is CVE-2026-114125 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-114125 updated cvss 8.8

storybook: Storybook: Arbitrary code execution via insufficient message-origin restrictions

  • Red Hat Node HealthCheck Operator workload-availability/node-remediation-console-rhel8, workload-availability/node-healthcheck-rhel9-operator, workload-availability/node-healthcheck-operator-bundle, workload-availability/node-healthcheck-must-gather-rhel9 Red Hat Build of Podman Desktop rh-podman-desktop 3c6fc75a2a6cf5bb9b8a667fddcbbf428132badc
    affected: no fix available
  • Red Hat Hardened Images grafana13.1 13.1.8-0.4.hum1, grafana13.2 13.2.4-0.3.hum1, grafana12.4 12.4.13-0.3.hum1
    fixed: vendor fix RHSA-2026:88478
  • Red Hat Enterprise Linux 9 grafana, grafana-selinux, grafana 12.4.3-2.el10 Red Hat Enterprise Linux 10 grafana 12.4.3-2.el10
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
12d ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 8.6 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA 4.0 8.6 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/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

Affected packages

ecosystem package affected fixed in
npm 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
8.6.19
9.1.21
10.6.2
11.0.0-alpha.6
npm @storybook/core
>=8.0.0, <8.6.19
8.6.19
npm @storybook/core-server
>=8.0.0, <8.6.19
8.6.19
npm @storybook/experimental-addon-test
>=8.0.0, <8.6.19
8.6.19
npm @storybook/addon-vitest
>=9.0.0, <9.1.21
>=10.0.0, <10.6.2
>=11.0.0-alpha.0, <11.0.0-alpha.6
9.1.21
10.6.2
11.0.0-alpha.6
npm @storybook/addon-mcp
>=10.6.0, <10.6.2
>=11.0.0-alpha.0, <11.0.0-alpha.6
10.6.2
11.0.0-alpha.6

Affected products

  • storybookjs storybook

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code
  • CWE-346 Origin Validation Error
  • CWE-1021 Improper Restriction of Rendered UI Layers or Frames
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory
  • CWE-441 Unintended Proxy or Intermediary
  • CWE-749 Exposed Dangerous Method or Function
  • CWE-862 Missing Authorization
  • CWE-96 Improper Neutralization of Directives in Statically Saved Code

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.