HT Mega < 2.7.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via block_css and inner_css

Description

The HT Mega – Absolute Addons For Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'block_css' and 'inner_css' parameters in all versions up to, and including, 2.7.6 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.