Final answer:
Lisa created a backdoor for remote maintenance of an application storing personal information, which is a significant security risk.
Step-by-step explanation:
Lisa's actions describe the creation of a backdoor into the application for the purposes of remote maintenance. This is a method by which she can bypass standard authentication procedures to gain access to the system, usually for legitimate purposes such as updating software or troubleshooting issues. However, this practice poses a significant security risk, as it may be exploited by unauthorized users if discovered. It is critical that any such backdoor is well-protected and monitored to prevent potential breaches of personal information.