Cross-site scripting in MyBB

1) Cross-site scripting

EUVDB-ID: #VU31130

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-19201

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data in the ModCP Profile Editor in MyBB before 1.8.20. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Update to version 1.8.20.

Vulnerable software versions

MyBB: 1.8.0 - 1.8.19

CPE2.3

• cpe:2.3:a:mybb:mybb:1.8.0:*:*:*:*:*:*:*
• cpe:2.3:a:mybb:mybb:1.8.1:*:*:*:*:*:*:*
• cpe:2.3:a:mybb:mybb:1.8.2:*:*:*:*:*:*:*

External links

http://blog.mybb.com/2019/02/27/mybb-1-8-20-released-security-maintenance-release/
http://github.com/mybb/mybb/blob/feature/SECURITY.md#technical-details-of-known-issues

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.