CVE-2003-1131: Activecampaign Knowledgebuilder

High severity, CVSS 7.5. EPSS: 3.4% chance of exploitation in the next 30 days.

PHP remote file inclusion vulnerability in index.php in KnowledgeBuilder, referred to as KnowledgeBase, allows remote attackers to execute arbitrary PHP code by modifying the page parameter to reference a URL on a remote web server that contains the code.

Affected products

• Activecampaign Knowledgebuilder: version 2.0.1 only; version 2.1.0 only; version 2.1.4 only; version 3.0.1 only

Published 2003-12-31. Last modified 2026-06-16.