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Test ID:
Category:Web application abuses
Title:MyBB < 1.8.21 Multiple Vulnerabilities
Summary:MyBB is prone to multiple vulnerabilities.
MyBB is prone to multiple vulnerabilities.

Vulnerability Insight:
Following vulnerabilities exist:

- An attacker can exploit a parsing flaw in the Private Message / Post renderer
that leads to [video] BBCode persistent XSS to take over any forum account,
aka a nested video MyCode issue. (CVE-2019-12830)

- An attacker can abuse a default behavior of MySQL on many systems
(that leads to truncation of strings that are too long for a database column)
to create a PHP shell in the cache directory of a targeted forum via a crafted XML import,
aka theme import stylesheet name RCE. (CVE-2019-12831)

- Find Orphaned Attachments reflected XSS

- Post edit reflected XSS

- Private Messaging folders SQL injection

- Potential phar deserialization through Upload Path

Vulnerability Impact:
Successful exploitation would allow an attacker to execute arbitrary code on the target machine.

Affected Software/OS:
MyBB through version 1.8.20.

Update to version 1.8.21.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2019-12830
Common Vulnerability Exposure (CVE) ID: CVE-2019-12831
CopyrightCopyright (C) 2019 Greenbone Networks GmbH

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