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CVE-2026-47428— Vitest browser mode serves unsanitized otelCarrier query parameter as inline script

Quick assessment

Affected
vitest-dev vitest
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vitest vitest是Vitest公司的一款快速的前端测试框架。 Vitest 4.0.17版本至4.1.6之前版本和5.0.0-beta.0版本至5.0.0-beta.3之前版本存在跨站脚本漏洞，该漏洞源于Browser Mode服务将otelCarrier查询参数直接插入到内联模块脚本中，允许经过构造的浏览器运行器URL在Vitest服务器源中执行任意JavaScript并恢复用于认证API调用的VITEST_API_TOKEN。

CVSS 9.6 · Critical EPSS 0.61% · P48

Affected Version Matrix 2

VendorProduct Version RangeStatus
vitest-dev vitest >= 4.0.17, < 4.1.6 affected
>= 5.0.0-beta.0, < 5.0.0-beta.3 affected
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I. Basic Information for CVE-2026-47428

Vulnerability Information
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Vulnerability Title
Vitest browser mode serves unsanitized otelCarrier query parameter as inline script
Source: CVE Program / CVE List V5
Vulnerability Description
Vitest is a testing framework powered by Vite. From 4.0.17 until 4.1.6 and 5.0.0-beta.3, Vitest Browser Mode served /__vitest_test__/ with the otelCarrier query parameter inserted directly into an inline module script, allowing a crafted browser-runner URL to execute arbitrary JavaScript in the Vitest server origin and recover VITEST_API_TOKEN for authenticated API calls. This issue is fixed in versions 4.1.6 and 5.0.0-beta.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Vitest 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vitest vitest是Vitest公司的一款快速的前端测试框架。 Vitest 4.0.17版本至4.1.6之前版本和5.0.0-beta.0版本至5.0.0-beta.3之前版本存在跨站脚本漏洞，该漏洞源于Browser Mode服务将otelCarrier查询参数直接插入到内联模块脚本中，允许经过构造的浏览器运行器URL在Vitest服务器源中执行任意JavaScript并恢复用于认证API调用的VITEST_API_TOKEN。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vitest-dev vitest >= 4.0.17, < 4.1.6 -

II. Public POCs for CVE-2026-47428

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7934 chars
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Trigger conditions & impact
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III. Intelligence Information for CVE-2026-47428

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Patches & Fixes for CVE-2026-47428 (2)

Vendor Advisories for CVE-2026-47428 (1)

Vendor Pages for CVE-2026-47428 (1)

Other References for CVE-2026-47428 (1)

Same Patch Batch · vitest-dev · 2026-07-14 · 3 CVEs total

CVE-2026-47429 9.8 CRITICAL Vitest: Arbitrary file can be read and executed when Vitest UI server is listening
CVE-2026-53633 9.8 CRITICAL Vitest: Exposed Browser Mode API Can Proxy CDP and Overwrite Config Files, Leading to RCE

IV. Related Vulnerabilities

Same product: vitest
Same vendor: vitest-dev
Same weakness: CWE-79

V. Comments for CVE-2026-47428

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