Someone uploaded a description of Internet Explorer Win8-10 RCE with Sandbox Escape, apparently for sale.

The submission form seems to be in a pre-written template.

I googled it, seems to belong to Hacking Team according to leaked Wikileaks documents.

https://pastebin.com/4Bqc2quA 

If this was only uploaded to pastebin, the fact it has no contact details lead me to think it was an OPSEC mistake and the person wants to sell it to Hacking Team.

If this was taken from a forum (I found no indication for that) then it could be a scam.

if a 0day abusing 2 logic bugs that are used to load and execute remote dll in rundll32 is found in the future, you will know this was not fake.