CRITICAL

CVE-2026-47428

CVSS v3

9.6

CRITICAL

EPSS Score

0.6 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

@vitest/browsernpmfrom 5.0.0-beta.0 · fixed in 5.0.0-beta.3

Vendor advisories

CVE-2026-47428 Red Hat Product Security3 products fixed
vitest: Vitest: Arbitrary code execution via crafted browser-runner URL
RHSA-2026:39058 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Published: 2026-07-14
Last Modified: 2026-07-15

Frequently asked questions

What is CVE-2026-47428?

Is CVE-2026-47428 actively exploited?

Active exploitation of CVE-2026-47428 has not been confirmed. Its EPSS score was 0.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-47428?

CVE-2026-47428 has a CVSS v3 base score of 9.6 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

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