SourceCodester Customer Support System 1.0 contains an incorrect access control vulnerability in ajax.php. The AJAX dispatcher does not enforce authentication or authorization before invoking administrative methods in admin_class.php based on the action parameter. An unauthenticated remote attacker can perform sensitive operations such as creating customers and deleting users (including the admin account), as well as modifying or deleting other application records (tickets, departments, comments), resulting in unauthorized data modification.

A cross-site scripting (XSS) vulnerability in Customer Support System v1 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the contact parameter at /customer_support/index.php?page=customer_list.

Cross Site Scripting vulnerability in Customer Support System v.1.0 allows a remote attacker to escalate privileges via a crafted script firstname, "lastname", "middlename", "contact" and address parameters.

A directory listing vulnerability in Customer Support System v1 allows attackers to list directories and sensitive files within the application without requiring authorization.

A cross-site scripting (XSS) vulnerability in Customer Support System v1 allows attackers to execute arbitrary web scripts or HTML via a crafted payload injected into the firstname parameter at /customer_support/index.php?page=customer_list.

A directory listing vulnerability in Customer Support System v1 allows attackers to list directories and sensitive files within the application without requiring authorization.