XSS is cross-site scripting, a type of computer security vulnerability.
XSS may also refer to:
XSS file, a Microsoft Visual Studio Dataset Designer Surface Data file X11 Screen Saver extension, of X11 Assan language (ISO 639-3 code) Xbox Series S, a digital-only video game console XSS.is, a now defunct Russian hacking forum
See also Experimental Satellite System-11 (XSS 11), a spacecraft CSS (disambiguation)