CVE-2026-112949
MEDIUM
CVSS 4.7
Published: 2026-10-20
Modified: 2026-10-20
Tenable Plugin
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Threat Intelligence Pending
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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.
Quick Facts
| CVE ID | CVE-2026-112949 |
| CVSS Score | 4.7 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N |
| Published | 2026-10-20 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |
References
- https://github.com/vitest-dev/vitest/commit/15cc006aa9f8683d…
- https://github.com/vitest-dev/vitest/commit/b825313243dc5575…
- 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/GHS…