XSS Auditor bypass

XSS Auditor is getting pretty good at least in the tests I was doing however after a bit of testing I found a cool bypass. Without studying the code it seems that it checks for valid JavaScript within the vector, I thought I could use this to my advantage. I came up with the idea of using an existing script block to smuggle my vector and reusing the closing script on the page. The page contains a script block like this:

<script>x = "MY INJECTION"</script>

As every XSS hacker knows you can use a “</script>” block to escape out of the script block and inject a HTML XSS vector. So I broke out of the script block and used the trailing quote to form my vector. Like so:


You could of course use a standard ",alert(1)," but what if quotes are filtered? I then came up with the idea of using SVG and an HTML escaped quote. This bypasses the filter and is a HTML XSS vector that doesn’t have a DOM vulnerability so it’s within scope of the filter and is very common in my experience. Here is the final vector:

x = "</script><svg><script>alert(1)+&quot;";

XSS auditor PoC

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