The WP Cerber Security plugin for WordPress is vulnerable to stored cross-site scripting via the log parameter when logging in to the site in versions up to, and including, 9.1. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The WP Cerber Security, Anti-spam & Malware Scan WordPress plugin before 9.3.3 does not properly block access to the REST API users endpoint when the blog is in a subdirectory, which could allow attackers to bypass the restriction in place and list users

The WP Cerber Security plugin for WordPress is vulnerable to security protection bypass in versions up to, and including 9.0, that makes user enumeration possible. This is due to improper validation on the value supplied through the 'author' parameter found in the ~/cerber-load.php file. In vulnerable versions, the plugin only blocks requests if the value supplied is numeric, making it possible for attackers to supply additional non-numeric characters to bypass the protection. The non-numeric characters are stripped and the user requested is displayed. This can be used by unauthenticated attackers to gather information about users that can targeted in further attacks.

The WP Cerber Security, Anti-spam & Malware Scan WordPress plugin before 8.9.6 does not sanitise the $url variable before using it in an attribute in the Activity tab in the plugins dashboard, leading to an unauthenticated stored Cross-Site Scripting vulnerability.

WP Cerber before 8.9.3 allows MFA bypass via wordpress_logged_in_[hash] manipulation.

WP Cerber before 8.9.3 allows bypass of /wp-json access control via a trailing ? character.