Please forward this error screen to 209. 2017 reported that XSS is still a major threat vector. XSS effects vary in range from petty nuisance to significant security risk, depending on the sensitivity of the data handled by the vulnerable site and the nature of any security mitigation implemented by the site’s owner. Exploiting read reflected in you online pdf of these, attackers fold malicious content into the content being delivered from the compromised site.
XSS vulnerabilities have been reported and exploited since the 1990s. Non-persistent XSS vulnerabilities in Google could allow malicious sites to attack Google users who visit them while logged in. Because HTML documents have a flat, serial structure that mixes control statements, formatting, and the actual content, any non-validated user-supplied data included in the resulting page without proper HTML encoding, may lead to markup injection. A classic example of a potential vector is a site search engine: if one searches for a string, the search string will typically be redisplayed verbatim on the result page to indicate what was searched for.
HTML control characters, a cross-site scripting flaw will ensue. A reflected attack is typically delivered via email or a neutral web site. The bait is an innocent-looking URL, pointing to a trusted site but containing the XSS vector. If the trusted site is vulnerable to the vector, clicking the link can cause the victim’s browser to execute the injected script. A classic example of this is with online message boards where users are allowed to post HTML formatted messages for other users to read.