An id GET parameter of the WordPress Membership SwiftCloud.io WordPress plugin through 1.0 is not properly sanitised, escaped or validated before inserting to a SQL statement, leading to SQL injection.
https://wpscan.com/vulnerability/68530e63-bba3-4a9a-ae83-516684aa5dc6
https://codevigilant.com/disclosure/2021/wp-plugin-club-management-software/