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.

The Qubely WordPress plugin before 1.8.5 does not validate and escape some of its block options before outputting them back in a page/post where the block is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.

The Qubely WordPress plugin before 1.8.6 allows unauthenticated user to send arbitrary e-mails to arbitrary addresses via the qubely_send_form_data AJAX action.

The Qubely WordPress plugin before 1.7.8 does not have authorisation and CSRF check on the qubely_delete_saved_block AJAX action, and does not ensure that the block to be deleted belong to the plugin, as a result, any authenticated users, such as subscriber can delete arbitrary posts