MyBB Latest Posts On Profile 1.1 Cross Site Scripting

2018.05.10
Credit: 0xB9
Risk: Low
Local: No
Remote: Yes
CWE: CWE-79


CVSS Base Score: 3.5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 6.8/10
Exploit range: Remote
Attack complexity: Medium
Authentication: Single time
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

# Exploit Title: MyBB Latest Posts on Profile Plugin v1.1 - Cross-Site Scripting # Date: 4/20/2018 # Author: 0xB9 # Contact: luxorforums.com/User-0xB9 or 0xB9[at]pm.me # Software Link: https://community.mybb.com/mods.php?action=view&pid=914 # Version: 1.1 # Tested on: Ubuntu 17.10 # CVE: CVE-2018-10580 1. Description: Adds a new section to user profiles that will display their last posts. 2. Proof of Concept: Persistent XSS - Create a thread with the following subject <script>alert('XSS')</script> - Now visit your profile to see the alert. 3. Solution: I reported the plugin twice over the past 3 weeks and recieved no response. The following should be added in line 236 to properly sanitize thread subjects. $d['tsubject'] = htmlspecialchars_uni($d['tsubject']);


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