Phpunit Phpunit Src Util Php Eval-stdin.php Cve ^hot^: Vendor

Full server compromise, data theft, and malware installation, such as the Androxgh0st malware often seen targeting this exploit in 2024 and 2025. Affected Versions PHPUnit 4.x: Versions before 4.8.28. PHPUnit 5.x: Versions before 5.6.3. PHPUnit.Eval-stdin.PHP.Remote.Code.Execution

But a story is never only about fixes. It is about what led to them.

: PHPUnit before 4.8.28 and 5.x before 5.6.3 Technical Analysis

An attacker simply sends a POST request to:

The next morning the repo was cleaner. The tests were greener. Someone had already pushed a tiny README line—“Dev helpers belong in tools/, not in releases.” It was a sentence she kept in her pocket like a pebble: hard-won, small, useful. vendor phpunit phpunit src util php eval-stdin.php cve

Or simply block access to the entire /vendor/ directory:

POST /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php HTTP/1.1 Host: vulnerable-target.com Content-Type: application/x-www-form-urlencoded Content-Length: 53 Use code with caution. Consequences of a Successful Exploit CVE-2017-9841 Detail - NVD

) on your server by sending a POST request to that URI. This often leads to full server compromise or the theft of sensitive data like Miggo Security Affected Versions CVE-2017-9841 - Ubuntu

is a critical-severity vulnerability in PHPUnit, the most widely used unit testing framework for PHP. With a CVSS v3 score of 9.8 (Critical) , this vulnerability allows an unauthenticated remote attacker to execute arbitrary PHP code on a target server by simply sending a crafted HTTP POST request to the exposed file. PHPUnit

Even years after its discovery in 2017, the vulnerability, often triggered by accessing vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php , remains a top target for attackers. This article breaks down what this vulnerability is, why it is still dangerous in 2026, and how to protect your applications.

As a developer, the lesson is simple: Never routable, never directly accessible. As a security professional, never underestimate the power of simple file existence checks—sometimes the smallest file delivers the biggest breach.

Several open-source tools can help you scan for this vulnerability at scale:

: The eval() function in PHP executes any string passed to it as active PHP code. The tests were greener

That’s it. Just two lines.

CVE-2017-9841 is a vulnerability that allows remote, unauthenticated attackers to execute arbitrary PHP code on a server. The Root Cause

This line reads the raw body of an HTTP request (via php://input ) and executes it using the eval() function. If the /vendor folder is publicly accessible from the web, anyone can send a crafted POST request to execute arbitrary code on your server. PHPUnit 4.x: Prior to version 4.8.28 PHPUnit 5.x: Prior to version 5.6.3 Exploitation Example CVE-2017-9841 Detail - NVD