Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Themeum Qubely – Advanced Gutenberg Blocks allows Stored XSS. This issue affects Qubely – Advanced Gutenberg Blocks: from n/a through 1.8.12.

The Qubely – Advanced Gutenberg Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘align’ and 'UniqueID' parameter in all versions up to, and including, 1.8.12 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.