The PDF Flipbook, 3D Flipbook—DearFlip plugin for WordPress is vulnerable to Stored Cross-Site Scripting via outline settings in all versions up to 2.3.52 due to insufficient input sanitization and output escaping on user-supplied data. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The PDF Flipbook, 3D Flipbook, PDF embed, PDF viewer – DearFlip plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'pdf_source' parameter in all versions up to, and including, 2.3.32 due to insufficient input sanitization and output escaping. 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.