CVE-2021-39338CWE-79

MyBB Cross-Poster <= 1.0 Authenticated Stored Cross-Site Scripting

Medium · published October 15, 2021

CVSS v3.1
5.5
EPSS
1%
Percentile
60.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00946 · 60.8th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2021-10-15T12:15Z
EPSS history
Timeline
  • 15 OCT 12:15Z
    MyBB Cross-Poster <= 1.0 Authenticated Stored Cross-Site Scripting
    cvelistv5