OctoberCMS 1.0.425 Cross Site Scripting

`# Exploit Title: OctoberCMS 1.0.425 (aka Build 425) Stored XSS  
# Vendor Homepage: https://octobercms.com/  
# Software Link: https://octobercms.com/download  
# Exploit Author: Ishaq Mohammed (  
https://packetstormsecurity.com/files/author/13150/ )  
# Contact: https://twitter.com/security_prince  
# Website: https://about.me/security-prince  
# Category: webapps  
# CVE: CVE-2017-15284  
  
1. Description  
  
Cross-Site Scripting exists in OctoberCMS 1.0.425 (aka Build 425), allowing  
a least privileged user to upload an SVG file containing malicious code as  
the Avatar for the profile. When this is opened by the Admin, it causes  
JavaScript execution in the context of the Admin account.  
  
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-15284  
  
2. Proof of Concept  
  
Steps to Reproduce:  
  
- Login using a normal user and click on my account.  
- Click on the avatar.  
- Upload the malicious .svg file which contains the javascript  
- Click on save.  
- Login in another browser with Admin Credentials.  
- Click on Settings > Administrators.  
- Select the normal user's avatar and click on Attachment URL.  
  
3. Reference  
  
https://github.com/octobercms/library/commit/3bbbbf3da469f457881b5af902eb0b  
89b95189a2  
  
4. Solution  
  
The vulnerability will be patched by the vendor in the next release of  
OctoberCMS.  
  
--   
Best Regards,  
Ishaq Mohammed  
https://about.me/security-prince  
`