Cross site scripting(XSS) is a very serious issue faced by big companies like Facebook, Twitter, Google, Microsoft, etc in the past.
XSS is still a very major vulnerability faced by many websites on the Internet these days.
So, what is this Cross site scripting? Why is it soo dangerous?
In XSS, an attacker injects malicious script in a webpage’s source code. A website is vulnerable to XSS if the user input is not treated properly, and if the html tags are not escaped.
Briefly, cookies are some strings used by websites to identify their users. So, if a hacker has your cookies, he can impersonate you on that particular website. In simple words, if the hacker steals your Facebook cookies, he will be able to login to your Facebook account without entering your password.
Obviously Facebook or Twitter or any big company is not vulnerable to this kind of simple XSS now , but there are times when these sites are actually vulnerable to this simple attack and sh*t happened!
And yes, there are many websites on the Internet which are still vulnerable to XSS. And they must be fixed ASAP to maintain their web security.
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