CVE-2021-36873

Description

Authenticated Persistent Cross-Site Scripting (XSS) vulnerability in WordPress iQ Block Country plugin (versions <= 1.2.11). Vulnerable parameter: &blockcountry_blockmessage.

CVSS (Vector and Score)

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N - 5.5 MEDIUM

Affected Application

WordPress iQ Block Country plugin

Affected Version

<= 1.2.11

Total Installation

30,000+

Steps to Reproduce

Login as administrator
Go to http://localhost/wp-admin/options-general.php?page=iq-block-country%2Flibs%2Fblockcountry-settings.php
Find Message to display when people are blocked: form
Input </textarea><script>alert(1)</script>
Scroll down and press Save Changes button

Proof of Concept

Video

https://youtu.be/WtOiHY5R-t0

Image