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Fencer Vulns
medium 4.7

CVE-2026-112949 json

Vitest: Code injection via unauthenticated manual mock registration

published 2026-10-20 20 d ago modified 2026-10-23 17 d ago also EUVD-2026-105148 , GHSA-qxg6-89mg-rqv8

cvss
4.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits
0
none known

Summary

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.

Patch / fix

  • npm @vitest/mocker 4.1.12, 5.0.3
  • vitest.dev vitest 4.1.12, 5.0.3
  • vitest.dev vitest/mocker 4.1.12, 5.0.3

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-112949 updated cvss 4.7

vitest: Vitest: Cross-site scripting via unescaped mock module URL

  • Red Hat AMQ Broker 7 amq-broker-bin.zip 7.14.1.CR3, amq-broker-maven-repository.zip 7.14.1.CR3
    affected: no fix available “Fix deferred”
  • Red Hat Ansible Automation Platform 2 automation-platform-ui 2.6.15-1.el9ap, automation-gateway 2.5.20260923-1.el9ap, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9
    affected: no fix available, no fix planned “Out of support scope”
  • Red Hat Build of Keycloak rhbk-quarkus-dist.zip 26.6.7.CR1, keycloak-operator.redhat-00001.zip 26.6.6, keycloak-operator.redhat-00003.zip 26.6.7 Red Hat Build of Podman Desktop rh-podman-desktop 3c6fc75a2a6cf5bb9b8a667fddcbbf428132badc Red Hat JBoss Enterprise Application Platform 8 jboss-eap-runtime-maven-repository.zip 8.1.2, jboss-eap.1-runtime-maven-repository.zip 8.1.0 Red Hat JBoss Enterprise Application Platform Expansion Pack jboss-eap-runtime-maven-repository.zip 8.1.2, jboss-eap.1-runtime-maven-repository.zip 8.1.0 Red Hat Trusted Artifact Signer rhtas/rhtas-console-ui-rhel9
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images grafana13.2 13.2.3-0.3.hum1, prometheus3.13 3.13.4-0.1.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
17 d ago

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/vitest-dev/vitest/security/advisories/GHSA-qxg6-89mg-rqv8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 4.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm @vitest/mocker
>=2.1.0-beta.7, <4.1.12
>=5.0.0-beta.1, <5.0.3
4.1.12
5.0.3

Affected products

  • vitest-dev vitest
  • @vitest mocker

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code
  • CWE-116 Improper Encoding or Escaping of Output
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.