WordPress Cookie Law Bar 1.2.1 Cross Site Scripting

`# Exploit Title: WordPress Plugin Cookie Law Bar 1.2.1 - 'clb_bar_msg' Stored Cross-Site Scripting (XSS)  
# Date: 2021-05-24  
# Exploit Author: Mesut Cetin  
# Vendor Homepage: https://www.cookielawinfo.com/wordpress-plugin/  
# Software Link: https://wordpress.org/plugins/cookie-law-bar/  
# Version: 1.2.1  
# Tested on: Ubuntu 16.04 LTS, Wordpress 5.7.2  
  
# the "Bar Message" text field is vulnerable to stored XSS due to unsanitized user input  
# an authenticated attacker can retrieve cookies / sensitive data of all Wordpress users  
  
# proof of concept  
# navigate to the settings of the Cookie Law Bar under  
  
http://localhost/wp-admin/options-general.php?page=clb  
  
# inject the payload: </script><script>alert(document.cookie)</script> into the "Bar Message field" and save it  
  
# browsing through the Wordpress pages shows the cookies  
`