Once Remote Code Execution (RCE) is achieved, the attacker can:
Next time you run composer install , ask yourself—is this dependency a tool or a threat? And if you ever see eval-stdin.php in a production server, treat it as an active breach. Delete it. Patch it. Learn from it. vendor phpunit phpunit src util php eval-stdin.php cve
With a CVSS score of 9.8 (CRITICAL) , this flaw allows for total system compromise. Attackers can steal environment variables ( .env files), exfiltrate AWS credentials, or deploy web shells to maintain persistent access. Why is it still a threat? Once Remote Code Execution (RCE) is achieved, the
Popular frameworks like Laravel bundle PHPUnit by default. New developers who are learning the ropes might follow a tutorial Patch it
: Never expose vendor/ as a web-accessible directory unless absolutely necessary; configure your web server to block access to vendor/ .
The original code inside eval-stdin.php looked something like this:
