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CVE-2026-53633 — Vitest is a testing framework powered by Vite.

Key facts

CVE-2026-53633 is a Critical (9.8) vulnerability: Vitest is a testing framework powered by Vite.. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-53633
Severity Critical (9.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-53633/

Details

English | 한국어

Description

Vitest is a testing framework powered by Vite. From 3.0.0 until 3.2.5, 4.1.8, and 5.0.0-beta.4, Vitest Browser Mode exposed a cdp() API that forwarded raw Chrome DevTools Protocol methods without being gated by allowWrite or allowExec, allowing a remote client with exposed browser API metadata to use CDP Page.setDownloadBehavior and Runtime.evaluate to overwrite vite.config.ts and execute attacker-controlled Node.js code. This issue is fixed in versions 3.2.5, 4.1.8, and 5.0.0-beta.

Vulnerability Details

Property Value
CVE ID CVE-2026-53633
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-53633/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-2026-53633

# 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/385a1aefd4c2bfa5e7d58bf7c6834c929969f2c7
  • https://github.com/vitest-dev/vitest/commit/63e3b2eee4d58da56786a6333f517b9b492528c7
  • https://github.com/vitest-dev/vitest/commit/e4067b3b150005fd42cf75f994300119245806b9
  • https://github.com/vitest-dev/vitest/pull/10444
  • https://github.com/vitest-dev/vitest/pull/10450
  • https://github.com/vitest-dev/vitest/pull/10456
  • https://github.com/vitest-dev/vitest/releases/tag/v3.2.5
  • https://github.com/vitest-dev/vitest/releases/tag/v4.1.8
  • https://github.com/vitest-dev/vitest/releases/tag/v5.0.0-beta.4
  • https://github.com/vitest-dev/vitest/security/advisories/GHSA-g8mr-85jm-7xhm

Generated by PoC Generator on 2026-07-15T10:05:26.834491025

Frequently asked questions

What is CVE-2026-53633?

CVE-2026-53633 is a Critical (9.8) 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-2026-53633?

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-2026-53633?

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.