Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M
CVE-2026-112949Vitest: Code injection via unauthenticated manual mock registration
Medium 4.7
In plain English
A medium-severity code injection in mocker from @vitest. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @vitest/mocker | 4.1.12 | GHSA-qxg6-89mg-rqv8 |
| npm | @vitest/mocker | 5.0.3 | GHSA-qxg6-89mg-rqv8 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| vitest-dev | vitest | >= 2.1.0-beta.7, < 4.1.12>= 5.0.0, < 5.0.3 |
| @vitest | mocker | >= 2.1.0-beta.7, < 4.1.12>= 5.0.0, < 5.0.3 |
Weakness: CWE-94, CWE-116, CWE-306 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
References
- https://github.com/vitest-dev/vitest/security/advisories/GHSA-qxg6-89mg-rqv8 x_refsource_CONFIRM
- https://github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751ce35 x_refsource_MISC
- https://github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e13473 x_refsource_MISC
- https://github.com/vitest-dev/vitest/releases/tag/v4.1.12 x_refsource_MISC
- https://github.com/vitest-dev/vitest/releases/tag/v5.0.3 x_refsource_MISC