CVE-2017-9841: PHPUnit Command Injection Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2022-02-15. EPSS: 100% chance of exploitation in the next 30 days.

Util/PHP/eval-stdin.php in PHPUnit before 4.8.28 and 5.x before 5.6.3 allows remote attackers to execute arbitrary PHP code via HTTP POST data beginning with a "<?php " substring, as demonstrated by an attack on a site with an exposed /vendor folder, i.e., external access to the /vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php URI.

Affected products

• Oracle Communications Diameter Signaling Router: from 8.0.0, up to and including 8.5.0
• PHPUnit Project PHPUnit: up to and including 4.8.27; from 5.0.0, before 5.6.3 (fixed in 5.6.3)

Published 2017-06-27. Last modified 2026-06-17.