Rank Math SEO WordPress Plugin vulnerabilities

The Rank Math SEO plugin for WordPress is vulnerable to PHP Object Injection via deserialization of untrusted input in the updateMeta REST API endpoint. An authenticated attacker with Contributor-level access or higher can inject a PHP object, and the presence of a POP chain allows remote code execution by writing a webshell to the uploads directory.

The Rank Math SEO WordPress plugin before version 1.0.277 does not verify that the metadata row being updated belongs to the object the user was authorised against. This allows users with the Author role and above to overwrite arbitrary post and user metadata, including that belonging to higher-privileged users.

The Rank Math SEO WordPress plugin before version 1.0.277.1 does not check whether a post is password protected before using its content to build publicly generated SEO metadata. This allows unauthenticated users to read the content of password-protected posts.