The issue allows remote attackers to include and execute arbitrary local files via directory traversal vulnerabilities. This can be achieved by including a .. (dot dot) in the `module` parameter to "graph.php", or the `module` or `file` parameter to "include/Ajax/CommonAjax.php", which can be reached through various modules such as "modules/Campaigns/CampaignsAjax.php", "modules/SalesOrder/SalesOrderAjax.php", and others. Additionally, remote authenticated users can include and execute arbitrary local files via a .. (dot dot) in the `step` parameter in an Import action to certain modules, including Accounts, Contacts, HelpDesk, Leads, Potentials, Products, or Vendors, reachable through "index.php" and related to "modules/Import/index.php" and multiple "Import.php" files.