Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Chandra Shekhar Sahu Site Offline Or Coming Soon Or Maintenance Mode allows Stored XSS.This issue affects Site Offline Or Coming Soon Or Maintenance Mode: from n/a through 1.5.6.
The Site Offline Or Coming Soon Or Maintenance Mode WordPress plugin before 1.5.3 prevents users from accessing a website but does not do so if the URL contained certain keywords. Adding those keywords to the URL's query string would bypass the plugin's main feature.