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Fencer Vulns
high 8.7

CVE-2026-114126 json

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

published 2026-10-21 18 d ago modified 2026-10-28 12 d ago also EUVD-2026-107408 , GHSA-px85-f4q5-jh77

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 45%
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, 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.

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

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-2026-114126 updated cvss 8.8

storybook: storybook: Arbitrary code execution via exposed WebSocket authentication token

  • 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: workaround, 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
yes
Technical impact
total
Assessed
12 d ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.7 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
CNA 4.0 8.7 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

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-22 Improper Limitation of a Pathname to a Restricted Directory
  • CWE-94 Improper Control of Generation of Code
  • CWE-306 Missing Authentication for Critical Functionality
  • CWE-1188 Initialization of a Resource with an Insecure Default

References

Sources

Fencer Vulns 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.