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Bypass ASP.NET Version 4.0.3 for XML Injection

I have a site which is not properly sanitizing the input and returns "XML error" on the website.

However if I craft a simple XML payload, it's detected as an unhandled exception of dangerous input by ASP NET.

I was able to finally bypass their Cloudflare WAF with this but now ASP NET issue is arising.

What should I be looking into? Messing around to craft a payload that bypasses it?

I know the version of ASP NET is very old but I have no idea where to look for vulnerabilities in that version that will allow me to deliver a proper payload.

Cheers!

i.imgur.com/ 5EoNiDC.png


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