CVE-2026-112949
Vitest: Code injection via unauthenticated manual mock registration
CVSS Score
4.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-94 CWE-116 CWE-306 |
| Vendor | vitest-dev |
| Product | vitest |
| Published | Oct 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected 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
References
github.com: https://github.com/vitest-dev/vitest/security/advisories/GHSA-qxg6-89mg-rqv8 github.com: https://github.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751ce35 github.com: https://github.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e13473 github.com: https://github.com/vitest-dev/vitest/releases/tag/v4.1.12 github.com: https://github.com/vitest-dev/vitest/releases/tag/v5.0.3