Vendor Phpunit Phpunit Src Util Php Eval-stdin.php Cve May 2026

The Critical Vulnerability in PHPUnit: Understanding and Mitigating CVE-2022-0847

A PoC exploit for CVE-2017-9841 - PHPUnit Remote Code ... - GitHub vendor phpunit phpunit src util php eval-stdin.php cve

Mechanism: The script uses eval() on raw HTTP POST data, allowing unauthenticated attackers to execute arbitrary PHP code. ⚠️ Affected Versions PHPUnit versions before 4.8.28 PHPUnit versions 5.x before 5.6.3 🚀 Exploitation Method vendor phpunit phpunit src util php eval-stdin.php cve

Marta opened the archive of the deployment logs and found two curious entries—POST requests from an IP on the fringe of their blocklist. No payload had run; the server had refused it that week because a firewall rule blocked requests lacking an internal header. A hairline of luck had saved them. She stared at the timestamps and felt the tightening in her chest that only relief can make: the universe had handed them a second chance. vendor phpunit phpunit src util php eval-stdin.php cve

The Prerequisite: What is PHPUnit and Why is it in vendor/?

PHPUnit is the de facto standard for unit testing in PHP. It is a development dependency, not a runtime dependency. In an ideal, secure world, PHPUnit resides only on a developer's laptop or a CI/CD server.

curl -X POST http://target.com/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php \
  -d "<?php system('id'); ?>"

The Vulnerability: CVE-2017-9841 Detailed

CVE ID: CVE-2017-9841
CVSS Score: 9.8 (Critical)
Affected Versions: PHPUnit 4.x, 5.x, 6.x (specific subversions before the patch)
Vector: Network
Complexity: Low
Privileges Required: None
User Interaction: None

Patch Details

composer require --dev phpunit/phpunit:^6.0