CVE-2003-0521: cPanel

Medium severity, CVSS 6.8. EPSS: 1.6% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in cPanel 6.4.2 allows remote attackers to insert arbitrary HTML and possibly gain cPanel administrator privileges via script in a URL that is logged but not properly quoted when displayed via the (1) Error Log or (2) Latest Visitors screens.

Affected products

• cPanel cPanel: version 5.0 only; version 5.3 only; version 6.0 only; version 6.2 only; version 6.4 only; version 6.4.1 only; …

Published 2003-08-18. Last modified 2026-06-16.