Which vulnerability has been detected in the web application?

While testing the company’s web applications, a tester attempts to insert the following test script
into the search area on the company’s web sitE.
<script>alert(” Testing Testing Testing “)</script>
Afterwards, when the tester presses the search button, a pop-up box appears on the screen with
the text: “Testing Testing Testing”. Which vulnerability has been detected in the web application?

A.
Buffer overflow

B.
Cross-site request forgery

C.
Distributed denial of service

D.
Cross-site scripting