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I recently came across an application that was vulnerable to HTML injection on the invite function. When I insert <img src="image.jpg"> the image got rendered on the mail I received.

I decided to test for blind ssrf out of band detection, so I gave the payload as <img src=" burp collaborator payload"> and sent the invite. When I analyzed the Burp collaborator I received a DNS Query which was like this below. enter image description here

I couldn't get any HTTP request from the server.

Is this vulnerable or not? If not, is there any possible way to escalate or any bypassing methods to get the HTTP request?

  • Was the invite sent to you? Was it you opening it that triggered the DNS request (e.g. your IP address, or possibly email provider's up address)? – multithr3at3d Jul 19 at 16:43
  • Yes, the invite is sent to my email. And as soon as I sent the invite request, I receive this DNS query which has the IP address of the organization. Without opening the email, only this DNS is triggered and nothing else. When I open the mail, it triggers further HTTP requests, which is from Google Image proxy trying to load the image from the burp collaborator payload I've passed. – None_None Jul 19 at 16:47
  • How are you trying to get an HTTP payload from the service? Remember the important part here: whatever response the HTTP service gives is going to be returned in an <img> tag. Therefore a text response most likely won't work, and in fact the server may just be ignoring any non-image responses. Therefore it's quite possible that the request is being made, but the response is not being returned to you. I'm just guessing though. – Conor Mancone Jul 19 at 18:35

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