The WP Blocks Hub plugin for WordPress is vulnerable to Stored Cross-Site Scripting via SVG File uploads in all versions up to, and including, 1.0.2 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the SVG file.

The Magazine Blocks – Blog Designer, Magazine & Newspaper Website Builder, Page Builder with Posts Blocks, Post Grid plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 1.3.14. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

The Ultimate Blocks WordPress plugin before 3.2.2 does not validate and escape some of its block attributes 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 GutenGeek Free Gutenberg Blocks for WordPress plugin for WordPress is vulnerable to Stored Cross-Site Scripting via SVG File uploads in all versions up to, and including, 1.1.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the SVG file.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Wpsoul Greenshift – animation and page builder blocks allows Stored XSS.This issue affects Greenshift – animation and page builder blocks: from n/a through 9.3.7.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Johan van der Wijk Content Blocks (Custom Post Widget) allows Stored XSS.This issue affects Content Blocks (Custom Post Widget): from n/a through 3.3.5.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in ThemeHunk Gutenberg Blocks – Unlimited blocks For Gutenberg allows Stored XSS.This issue affects Gutenberg Blocks – Unlimited blocks For Gutenberg: from n/a through 1.2.7.

Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in MediaRon LLC Custom Query Blocks allows Stored XSS.This issue affects Custom Query Blocks: from n/a through 5.3.1.

The Nova Blocks by Pixelgrade plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'align' attribute of the 'wp:separator' Gutenberg block in all versions up to, and including, 2.1.7 due to insufficient input sanitization and output escaping on user supplied attributes. 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 Attributes for Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘attributesForBlocks’ parameter in all versions up to, and including, 1.0.6 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.