Medium 4.7Published Oct 20, 2026

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

Updated under an hour ago (Oct 28, 2026, 1:10 AM ET)

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It affects vitest-dev vitest and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for vitest-dev vitest

Exploited in the last 30 days

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.

CVSS: 4.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-94, CWE-116, CWE-306
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 22, 2026
First seen by InfoSec Signals: Oct 20, 2026

Affected products

Affected products

vitest-dev vitest vitest_dev:vitest (from the name)	from 2.1.0-beta.7, < 4.1.12; from 5.0.0, < 5.0.3	CNA record
@vitest mocker vitest:mocker (from the name)	from 2.1.0-beta.7, < 4.1.12; from 5.0.0, < 5.0.3	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.