Critical 9.6Published Jul 14, 2026

CVE-2026-47428Vitest browser mode serves unsanitized otelCarrier query parameter as inline script

Updated under an hour ago (Oct 26, 2026, 6:40 AM ET)

Does this affect you?

It affects vitest-dev vitest. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for vitest-dev vitest

Exploited in the last 30 days

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.

CVSS: 9.6 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 15, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

vitest-dev vitest vitest_dev:vitest (from the name)	from 4.0.17, < 4.1.6; from 5.0.0-beta.0, < 5.0.0-beta.3	CNA record

References

https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cpppx-refsource-confirm
https://github.com/vitest-dev/vitest/pull/10283x-refsource-misc
https://github.com/vitest-dev/vitest/pull/10285x-refsource-misc
https://github.com/vitest-dev/vitest/commit/18af98cee1830604d57f6a02bf28f8067cdffc06x-refsource-misc
https://github.com/vitest-dev/vitest/commit/3514f9fa135c90e1c35754fc4d27c9cf351faafax-refsource-misc
https://github.com/vitest-dev/vitest/releases/tag/v4.1.6x-refsource-misc
https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.3x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.