The Passster WordPress plugin before 4.3.6 does not enforce its category-based content protection on the WordPress REST API, allowing unauthenticated users to read the full content, title, and excerpt of category-locked posts through the core REST API.

The Passster WordPress plugin before 4.3.9 does not correctly match its own public endpoint paths when deciding which REST API requests may bypass global password protection, comparing them as an unanchored substring of the request URI rather than against the resolved route, allowing an unauthenticated attacker to read the content of globally password-protected posts and pages.

The Passster WordPress plugin before 4.3.7 does not restrict low-privilege users holding the editposts capability from reading globally password-protected content through the WordPress core REST API when global protection is enabled, allowing any Contributor or higher to read the content of protected pages and posts without knowing the password.