The WX Subscribe 微信支付付费订阅 WordPress plugin through 1.2.1 does not sanitise and escape a parameter before using it in a SQL statement, allowing unauthenticated attackers to perform SQL injection attacks on installs where the payment key has not been configured.
https://wpscan.com/vulnerability/1086b82e-1105-4484-a49b-456ed5f45bf8/