MyBB 1.8.17 Cross-Site Scripting

2018.09.14
Credit: 0xB9
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: MyBB 1.8.17 - Cross-Site Scripting # Date: 2018-08-11 # Author: 0xB9 # Twitter: @0xB9Sec # Contact: 0xB9[at]pm.me # Software Link: https://mybb.com/download/ # Version: 1.8.17 # Tested on: Ubuntu 18.04 # CVE: CVE-2018-15596 # 1. Description: # On the forum RSS Syndication page you can generate a URL for example... # http://localhost/syndication.php?fid=&type=atom1.0&limit=15, the thread titles on # those generated links aren't sanitized. # 2. Proof of Concept: - Make or find a thread of yours on the RSS feed - Use this payload as the thread title <a href="//google.com">Cool Thread Title</a> - View RSS feed with your thread again but with the generated URL and click on your thread - When the thread is clicked you will be redirected to google.com


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