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I have received a report from a client that lists XSS vulnerabilities. The report shows reflected XSS vulnerabilities. In each vulnerability, the payload reflected is a single, unclosed <qss>

Normally, when I read about xss vulnerabilities I see a lot of payloads that will try to close an apostraphe or an input tag, and then inject a <script> tag or some arbitrary javascript.

What is the significance of the <qss> tag and how can it be used in an xss attack? The only thing I've uncovered with google is that it is a qt style sheet, but I still don't understand its role in XSS

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This appears to be a tag inserted by Qualys WAS (Web Application Scanning) engine.

<qss> tags are inserted as input in order to test whether these are encoded correctly as output.

This approach is safer on a live system that testing using <script> tags, which may have unintended consequences as a result of the scan becase the <qss> tags will be ignored by any browser.

  • this is correct. <qss> is a safe way to verify that angle brackets are allowed to be submitted and rendered as is in the final output. – mcgyver5 Jan 5 '15 at 18:33

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