If vulnerable, the server will execute system('id') and return the result to the attacker, giving them complete control over the web server user. Why is it Still Relevant in 2026?
The best fix is updating PHPUnit via Composer: composer update phpunit/phpunit Use code with caution. vendor phpunit phpunit src util php eval-stdin.php cve
When threat actors scan for this vulnerability, they leverage automated scripts to target popular open-source content management systems (CMS) and frameworks—including Laravel, WordPress, Drupal, MediaWiki, and Moodle—which heavily utilize PHPUnit during development. If vulnerable, the server will execute system('id') and