CVE-2026-112949

CVSS 4.7 (medium) · published 2026-10-20

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.

Weakness: CWE-94, CWE-116, CWE-306

Source: NVD CVE-2026-112949

References

• https://github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751ce35
• https://github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e13473
• 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

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