The documentation presented in the official WordPress Codex for the functions of add_query_arg() and remove_query_arg() led to the insecure usage of these functions. As a result, many WordPress plugins that used these functions are vulnerable to cross-site scripting (XSS). The vulnerability affects input functions in a plugin and must therefore be updated as soon as possible.

These are the affected plugins to date:

Jetpack
WordPress SEO
Google Analytics by Yoast
All In one SEO
Gravity Forms
Multiple Plugins from Easy Digital Downloads
UpdraftPlus
WP-E-Commerce
WPTouch
Download Monitor
Related Posts for WordPress
My Calendar
P3 Profiler
Give
Multiple iThemes products including Builder and Exchange
Broken-Link-Checker
Ninja Forms

There may be more plugins affected by the vulnerability. ALL users of WordPress are highly recommended to update their plugins immediately. Plugins can easily be updated through the WordPress Administrator.

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