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
https://wpscan.com/vulnerability/a8c6b077-ff93-4c7b-970f-3be4d7971aa5