QNAP Photo Station versions 5.7.0 and earlier are vulnerable to Cross-Site Scripting (XSS). An attacker can inject malicious JavaScript code into the application by sending a specially crafted URL to the vulnerable application. This code will be executed in the context of the user's browser, allowing the attacker to perform various malicious activities such as stealing cookies, hijacking the user's session, and redirecting the user to malicious websites.