Essential Blocks for Gutenberg < 4.5.4 - Contributor+ Stored Cross-Site Scripting

Description

The plugin is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 4.5.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.