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Fencer Intel
critical 9.6

CVE-2026-47428 json

Vitest browser mode serves unsanitized otelCarrier query parameter as inline script

published 5mo ago modified 18d ago also EUVD-2026-44401 , GHSA-2h32-95rg-cppp

cvss
9.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits
0
none known

Summary

Vitest is a testing framework powered by Vite. From 4.0.17 until 4.1.6 and 5.0.0-beta.3, Vitest Browser Mode served /__vitest_test__/ with the otelCarrier query parameter inserted directly into an inline module script, allowing a crafted browser-runner URL to execute arbitrary JavaScript in the Vitest server origin and recover VITEST_API_TOKEN for authenticated API calls. This issue is fixed in versions 4.1.6 and 5.0.0-beta.3.

Patch / fix

  • npm @vitest/browser 4.1.6, 5.0.0-beta.3
  • vitest.dev vitest 4.1.6, 5.0.0-beta.3
  • prometheus3.13 hummingbird 1 3.13.1-0.1.hum1

red hat advisories RHSA-2026:39058

Is CVE-2026-47428 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-2026-47428 updated cvss 8.3

vitest: Vitest: Arbitrary code execution via crafted browser-runner URL

  • Red Hat Hardened Images prometheus3.13 3.13.1-0.1.hum1
    fixed: vendor fix RHSA-2026:39058
  • Red Hat AMQ Broker 7 vitest 1.3.1 Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9 Red Hat Build of Keycloak vitest 1.3.1 Red Hat Build of Podman Desktop rh-podman-desktop.git Red Hat JBoss Enterprise Application Platform 8 vitest 1.3.1 Red Hat OpenShift Container Platform 4 openshift4/ose-agent-installer-ui-rhel9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift5/ose-agent-installer-ui-rhel9
    not affected: vulnerable code 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
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
3mo ago

Exploit prediction

0.58% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cppp referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
GitHub 3.1 9.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm @vitest/browser
>=4.0.17, <4.1.6
>=5.0.0-beta.0, <5.0.0-beta.3
4.1.6
5.0.0-beta.3

Affected products

  • vitest-dev vitest

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.

The maintainers of vitest-dev/vitest published their own advisory on GitHub. Reviewed sources take precedence over it.

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