Security Advisory: XSS Vulnerability Affecting Multiple WordPress Plugins

Multiple WordPress Plugins are vulnerable to Cross-site Scripting (XSS) due to the misuse of the add_query_arg() and remove_query_arg() functions. These are popular functions used by developers to modify and add query strings to URLs within WordPress.

The official WordPress Official Documentation (Codex) for these functions was not very clear and misled many plugin developers to use them in an insecure way. The developers assumed that these functions would escape the user input for them, when it does not. This simple detail, caused many of the most popular plugins to be vulnerable to XSS.

To date, this is the list of affected plugins:

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