KnowledgeBuilder contains a flaw that may allow a remote attacker to execute arbitrary commands. The issue is due to index.php not properly sanitizing user input supplied to the 'page' variable. This may allow an attacker to include a file from a remote host that contains arbitrary commands which will be executed by the vulnerable script.
Remote / Network Access
Loss of Integrity
Currently, there are no known workarounds or upgrades to correct this issue. However, ActiveCampaign has released a patch to address this vulnerability.