CVE Vulnerability

CVE-2021-39338

The MyBB Cross-Poster WordPress plugin is vulnerable to Stored Cross-Site Scripting due to insufficient input validation and sanitization via several parameters found in the ~/classes/MyBBXPSettings.php file which allowed attackers with administrative user access to inject arbitrary web scripts, in versions up to and including 1.0. This affects multi-site installations where unfiltered_html is disabled for administrators, and sites where unfiltered_html is disabled.

2.1 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

4.8 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.7 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required HIGH

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://github.com/BigTiger2020/word-press/blob/main/MyBB%20Cross-Poster.md Exploit Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39338 Third Party Advisory
https://plugins.trac.wordpress.org/browser/mybb-cross-poster/trunk/classes/MyBBXPSettings.php Patch Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:mybb_cross-poster_project:mybb_cross-poster:*:*:*:*:*:wordpress:*:*
Information

Published : 2021-10-15 01:15

Updated : 2021-10-20 03:38

NVD link : CVE-2021-39338

Mitre link : CVE-2021-39338

Products Affected
No products.
CWE
CWE-79