Vulnerability record · CVE-2026-47428 · published 14 July 2026

CVE-2026-47428: Cross-site scripting vulnerability

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.

9.6 CVSS 3.1 Critical EPSS 0.61% · top 52.8% CWE-79 · Cross-site scripting Deferred

9.6CVSS 3.1 base score

0.61%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

8References

15 Jul 2026Last modified by NVD

Description

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

References

Link	Tags
https://github.com/vitest-dev/vitest/commit/18af98cee1830604d57f6a02bf28f8067cdffc06
https://github.com/vitest-dev/vitest/commit/3514f9fa135c90e1c35754fc4d27c9cf351faafa
https://github.com/vitest-dev/vitest/pull/10283
https://github.com/vitest-dev/vitest/pull/10285
https://github.com/vitest-dev/vitest/releases/tag/v4.1.6
https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.3
https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cppp
https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cppp

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Source: NIST National Vulnerability Database (record CVE-2026-47428), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.