The RSS Icon Widget plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘link_color’ parameter in all versions up to, and including, 5.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Phil Spectrum Icon Widget allows DOM-Based XSS.This issue affects Icon Widget: from n/a through 1.1.0.

The Icon Widget plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's shortcode(s) in all versions up to, and including, 1.3.0 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The Icon Widget WordPress plugin before 1.3.0 does not validate and escape some of its shortcode attributes before outputting them back in the page, which could allow users with a role as low as contributor to perform Stored Cross-Site Scripting attacks which could be used against high privilege users such as admins.