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CVE-2026-112949— Vitest: Code injection via unauthenticated manual mock registration

Quick assessment

Affected
vitest-dev vitest
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vitest 是一个面向 JavaScript 和 TypeScript 项目的、原生基于 Vite 的测试框架。在 2.1.0-beta.7 至 4.1.12 以及 5.0.3 版本中，若存在一个未经认证的、非浏览器的 WebSocket 客户端能够访问开发服务器，并且该服务器使用了 interceptorPlugin，则攻击者可以注册一个手动模拟（manual mock）。攻击者控制的 URL 会被 函数以未转义的方式插入到生成的模块源码中。当开发者的浏览器加载受影响的模块时，攻击者控制的 JavaScript

CVSS 4.7 · Medium

Affected Version Matrix 4

VendorProduct Version RangeStatus
@vitest mocker >= 2.1.0-beta.7, < 4.1.12 affected
>= 5.0.0, < 5.0.3 affected
vitest-dev vitest >= 2.1.0-beta.7, < 4.1.12 affected
>= 5.0.0, < 5.0.3 affected
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I. Basic Information for CVE-2026-112949

Vulnerability Information
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Vulnerability Title
Vitest: Code injection via unauthenticated manual mock registration
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vitest-dev vitest >= 2.1.0-beta.7, < 4.1.12 -
@vitest mocker >= 2.1.0-beta.7, < 4.1.12 -

II. Public POCs for CVE-2026-112949

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III. Intelligence Information for CVE-2026-112949

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Patches & Fixes for CVE-2026-112949 (1)

Vendor Advisories for CVE-2026-112949 (1)

Vendor Pages for CVE-2026-112949 (2)

Same Patch Batch · vitest-dev · 2026-10-20 · 3 CVEs total

CVE-2026-112948 6.5 MEDIUM Vitest: Servers misapply `server.fs.deny`, serving `.env`, private keys, `.git`, and the A
CVE-2026-112950 5.9 MEDIUM Vitest: Windows backslash traversal bypasses the @vitest/mocker redirect allowlist fix

IV. Related Vulnerabilities

Same product: vitest
Same vendor: vitest-dev
Same weakness: CWE-94

V. Comments for CVE-2026-112949

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