CVE-2026-112949

MediumCVSS 4.7/10Last modified Oct 23, 2026

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.

Metrics

CVSS 3.1 4.7/10CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-94CWE-116CWE-306

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

VendorProductVersions
vitest-devvitest>= 2.1.0-beta.7, < 4.1.12; >= 5.0.0, < 5.0.3
@vitestmocker>= 2.1.0-beta.7, < 4.1.12; >= 5.0.0, < 5.0.3

References

Timeline

Published
Oct 20, 2026
Last modified
Oct 23, 2026
NVD status
Awaiting Analysis

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CVE-2026-112949: Medium severity, CVSS 4.7 | Vulnix