XSS (Cross Site Spreading) – a type of hacker attack

XSS – SEO WIKI

Cross Site Spreading (XSS) means cross-site scripting – a type of attack on a web resource that exploits vulnerabilities in the client authorization system on the server.

After a successful attack, executable malicious scripts that carry out the attack are introduced on the client machine.

The XSS abbreviation was chosen so as not to confuse cross-site scripting with cascading table designation (CSS).