CVE-2026-47428: Vitest-Dev Vitest

Critical severity, CVSS 9.6. EPSS: 0.6% chance of exploitation in the next 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.

Affected products

• Vitest-Dev Vitest: from 4.0.17, before 4.1.6 (fixed in 4.1.6); from 5.0.0-beta.0, before 5.0.0-beta.3 (fixed in 5.0.0-beta.3)

Published 2026-07-14. Last modified 2026-07-15.