MyBB Upcoming Events 1.32 Cross Site Scripting

2019.03.20

Credit: 0xB9

Risk: Low

Local: No

Remote: Yes

CVE: CVE-2019-9650

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 Upcoming Events Plugin 1.32 - Cross-Site Scripting
# Date: 3/8/2019
# Author: 0xB9
# Twitter: @0xB9Sec
# Contact: 0xB9[at]pm.me
# Software Link: https://community.mybb.com/mods.php?action=view&pid=1231
# Version: 1.32
# Tested on: Ubuntu 18.04
# CVE: CVE-2019-9650


1. Description:
This plugin shows upcoming calendar events on the forum index and portal page. Event names are vulnerable to XSS.
 

2. Proof of Concept:

- Go to the calander.php page and add a new event
- Input a payload for the event name   <script>alert('XSS')</script>

Payload will be executed on index.php



3. Solution:
Update to 1.33

See this note in RAW Version

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MyBB Upcoming Events 1.32 Cross Site Scripting

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