CVE-2026-47428 — Vitest is a testing framework powered by Vite.¶
Key facts
CVE-2026-47428 is a Critical (9.6) vulnerability: Vitest is a testing framework powered by Vite.. This entry ships a detection-only PoC and a Docker test lab.
| CVE | CVE-2026-47428 |
| Severity | Critical (9.6) |
| Detection / prevention | — |
| PoC | poc.py |
| Source | 2026/CVE-2026-47428/ |
Details¶
English | 한국어
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.
Vulnerability Details¶
| Property | Value |
|---|---|
| CVE ID | CVE-2026-47428 |
| Type | XSS |
| CVSS Score | 9.6 |
Proof of Concept¶
Download¶
# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-47428/poc.py
Usage¶
# Run PoC against target
python3 poc.py --target <TARGET_URL>
# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>
⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.
Test Lab¶
This repository includes a Docker-based test environment with both vulnerable and patched applications.
Quick Start¶
# Clone and navigate to CVE directory
cd CVE-2026-47428
# Start both applications
docker-compose up -d
# Run tests
./run-tests.sh # Linux/Mac
./run-tests.ps1 # Windows PowerShell
Application Endpoints¶
| Application | URL | Status |
|---|---|---|
| Vulnerable App | http://localhost:8080 | Shows vulnerability |
| Patched App | http://localhost:8081 | Demonstrates fix |
Directory Structure¶
├── README.md # English documentation
├── README_KO.md # Korean documentation
├── poc.py # PoC detection script
├── docker-compose.yml # Container orchestration
├── run-tests.sh # Linux/Mac test runner
├── run-tests.ps1 # Windows test runner
├── vulnerable-app/ # Vulnerable version
│ ├── app.py
│ ├── Dockerfile
│ └── requirements.txt
└── patched-app/ # Fixed version
├── app.py
├── Dockerfile
└── requirements.txt
References¶
- https://github.com/vitest-dev/vitest/commit/18af98cee1830604d57f6a02bf28f8067cdffc06
- https://github.com/vitest-dev/vitest/commit/3514f9fa135c90e1c35754fc4d27c9cf351faafa
- https://github.com/vitest-dev/vitest/pull/10283
- https://github.com/vitest-dev/vitest/pull/10285
- https://github.com/vitest-dev/vitest/releases/tag/v4.1.6
- https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.3
- https://github.com/vitest-dev/vitest/security/advisories/GHSA-2h32-95rg-cppp
Generated by PoC Generator on 2026-07-15T09:38:56.714074444
Frequently asked questions¶
What is CVE-2026-47428?¶
CVE-2026-47428 is a Critical (9.6) vulnerability: Vitest is a testing framework powered by Vite.. This entry ships a detection-only PoC and a Docker test lab.
How do I detect CVE-2026-47428?¶
Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.
How do I block or mitigate CVE-2026-47428?¶
Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.
For authorized security testing and research only. See the full source and NVD record.