Mikaela is reviewing code created by her organization for its possible exposure to web application vulnerabilities. Which one of the following conditions may make an application most vulnerable to a cross-site scripting (XSS) attack?

Cross-site scripting (XSS) attacks may take advantage of the use of reflected input in a web application where input provided by one user is displayed to another user. Input validation is a control used to prevent XSS attacks. XSS does not require an unpatched server or any firewall rules beyond those permitting access to the web application.