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MyBB Latest Posts On Profile 1.1 Cross Site Scripting

MyBB Latest Posts On Profile 1.1 Cross Site Scripting
Posted May 10, 2018
Authored by 0xB9

MyBB Latest Posts on Profile plugin version 1.1 suffers from a cross site scripting vulnerability.

tags | exploit, xss
advisories | CVE-2018-10580
SHA-256 | dcb55404f2e2259c21982c5821e15dc4146981a09a1df1810275e4594bc7b646

MyBB Latest Posts On Profile 1.1 Cross Site Scripting

Change Mirror Download
# 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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