CVE-2026-53633: Vitest-Dev Vitest

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

Vitest is a testing framework powered by Vite. From 3.0.0 until 3.2.5, 4.1.8, and 5.0.0-beta.4, Vitest Browser Mode exposed a cdp() API that forwarded raw Chrome DevTools Protocol methods without being gated by allowWrite or allowExec, allowing a remote client with exposed browser API metadata to use CDP Page.setDownloadBehavior and Runtime.evaluate to overwrite vite.config.ts and execute attacker-controlled Node.js code. This issue is fixed in versions 3.2.5, 4.1.8, and 5.0.0-beta.

Affected products

• Vitest-Dev Vitest: from 3.0.0, before 3.2.5 (fixed in 3.2.5); from 4.0.0, before 4.1.8 (fixed in 4.1.8); from 5.0.0-beta.0, before 5.0.0-beta.4 (fixed in 5.0.0-beta.4)

Published 2026-07-14. Last modified 2026-07-29.