CVE-2026-47428Public exploitNetwork attack vector

Server-side code execution via inline-script injection

Published Jul 14, 2026 · Updated Jul 14, 2026

Reflected XSS in Vitest Browser Mode 4.0.17 through 4.1.5 and 5.0.0-beta.0 through 5.0.0-beta.2 allows remote attackers to run script. The /vitest_test/ handler inserts the otelCarrier query value into an inline module script as executable source rather than serialized data. A user must navigate to a crafted runner URL while Browser Mode is active; the script can steal VITEST_API_TOKEN and use its authenticated API to modify configuration and execute Node code.

CVSS severity9.6
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Vitest Browser Mode 4.0.17 through 4.1.5 and 5.0.0-beta.0 through 5.0.0-beta.2 allows remote attackers to run script. The /vitest_test/ handler inserts the otelCarrier query value into an inline module script as executable source rather than serialized data. A user must navigate to a crafted runner URL while Browser Mode is active; the script can steal VITEST_API_TOKEN and use its authenticated API to modify configuration and execute Node code.

The record

CVE
CVE-2026-47428
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
VoidZero
Product
Vitest
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 4.0.17, < 4.1.6
  2. Affected versionversion=>= 5.0.0-beta.0, < 5.0.0-beta.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

VoidZero · Vitestversion=>= 4.0.17, < 4.1.6; version=>= 5.0.0-beta.0, < 5.0.0-beta.3

Published CVSS scores

9.6GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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