# jquery-xss-in-html  
jQuery < 3.5 Cross-Site Scripting (XSS) in html()  
Timmy Willison recently released a new version of jQuery. jQuery 3.5 fixes a cross-site scripting (XSS) vulnerability found in the jQuery’s HTML parser. The Snyk open source security platform estimates that 84% of all websites may be impacted by jQuery XSS vulnerabilities.  
Masato Kinugawa found a cross-site scripting (XSS) vulnerability in the htmlPrefilter method of jQuery, and published an example showing a popup alert window in the form of a challenge. (  
Below is a CodeQL query I wrote that can find user controlled values passed to html() which can be abused to perform Cross-Site Scripting.  
Please check your projects, submit responsible disclosures to projects that might be affected.  
* @name Taint-tracking to 'html' calls (with path visualization)  
* @description Tracks user-controlled values into 'html' calls (vulnerable to XSS in jQuery < 3.5)  
* and generates a visualizable path from the source to the sink.  
* @kind path-problem  
* @tags security  
* @id js/html-taint-path  
import javascript  
import DataFlow  
import DataFlow::PathGraph  
import DOM  
import semmle.javascript.dependencies.FrameworkLibraries  
class HtmlTaint extends TaintTracking::Configuration {  
HtmlTaint() { this = "HtmlTaint" }  
override predicate isSource(Node node) { node = DOM::locationSource() }  
override predicate isSink(Node node) { node =jquery().getACall().getAMethodCall("html").getArgument(0) }  
from HtmlTaint cfg, PathNode source, PathNode sink, FrameworkLibraryInstance framework, string version  
where cfg.hasFlowPath(source, sink) and"jquery", version)  
select sink.getNode(), source, sink, "Html with user-controlled input from $@. When using jquery version $@.", source.getNode(), "here", framework, version