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Because this script lacks authentication checks, any system that exposes its internal /vendor folder directly to the public web allows attackers to run arbitrary code remotely. Exploit Mechanics

The keyword vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php refers directly to within PHPUnit, the standard testing framework for PHP applications. Despite being disclosed in 2017, it remains one of the most heavily scanned and actively exploited flaws on the web.

Securing your application against this vulnerability involves proactive maintenance and secure configuration. 1. Update PHPUnit

: It passes that raw input directly into the eval() function, which interprets the string as active PHP code.