CVE-2026-112949

Medium

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.

SeverityMedium

CVSS4.7

Exploit probability—

Product@vitest/mocker

PublishedOct 20, 2026

First seenOct 20, 2026

Weakness typeCWE-94Code injection CWE-116CWE-116 CWE-306Missing authentication for critical function

How to fix

Update

@vitest/mocker4.1.12, 5.0.3 or later

Affected products

Product	Affected versions	Fixed in
@vitest/mockernpm	2.1.0-beta.7 ≤ v < 4.1.12, 5.0.0-beta.1 ≤ v < 5.0.3	4.1.12, 5.0.3

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