The Responsive Blocks – Page Builder for Blocks & Patterns plugin for WordPress is vulnerable to Unauthenticated Open Email Relay in all versions up to, and including, 2.2.0. This is due to insufficient authorization checks and missing server-side validation of the recipient email address supplied via a public REST API route. This makes it possible for unauthenticated attackers to send arbitrary emails to any recipient of their choosing through the affected WordPress site's mail server, effectively turning the site into an open mail relay.

Missing Authorization vulnerability in CyberChimps Responsive Blocks responsive-block-editor-addons allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Responsive Blocks: from n/a through <= 2.2.0.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in CyberChimps Responsive Blocks allows DOM-Based XSS. This issue affects Responsive Blocks: from n/a through 2.0.6.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in CyberChimps Responsive Blocks allows Stored XSS. This issue affects Responsive Blocks: from n/a through 2.0.2.