Vulnerability Description
Vitest is a Vite-native testing framework for JavaScript and TypeScript projects. From 2.1.0-beta.7 until 4.1.12 and 5.0.3, an unauthenticated non-browser WebSocket client that can reach a development server using interceptorPlugin can register a manual mock whose attacker-controlled url createManualModuleSource inserts unescaped into generated module source. When the developer browser loads the affected module, attacker-controlled JavaScript executes on the development-server origin. This issue is fixed in versions 4.1.12 and 5.0.3.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751
- https://github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e1
- https://github.com/vitest-dev/vitest/releases/tag/v4.1.12
- https://github.com/vitest-dev/vitest/releases/tag/v5.0.3
- https://github.com/vitest-dev/vitest/security/advisories/GHSA-qxg6-89mg-rqv8
- https://github.com/vitest-dev/vitest/security/advisories/GHSA-qxg6-89mg-rqv8
FAQ
What is CVE-2026-112949?
CVE-2026-112949 is a vulnerability with a CVSS score of 4.7 (MEDIUM). Vitest is a Vite-native testing framework for JavaScript and TypeScript projects. From 2.1.0-beta.7 until 4.1.12 and 5.0.3, an unauthenticated non-browser WebSocket client that can reach a development...
How severe is CVE-2026-112949?
CVE-2026-112949 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-112949?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.