1) Summary

Affected software  CMS Made Simple-2.2.15
Vendor URLhttp://www.cmsmadesimple.org/  <http://www.cmsmadesimple.org/>
Vulnerability     SQL injection

2) Vulnerability Description

The affected software is vulnerable to SQL injection via the m1_sortby POST parameter of the News module, reachable via the moduleinterface.php page.
The `sortby` parameter is sanitized by replacing the `'` with the `_` character, anyway it is possible to inject arbitrary SQL language without using the `'`.
This vulnerability is remotely exploitable and require authentication.
  
3) PoC and details

https://github.com/beerpwn/CVE/blob/master/cms_made_simple_2021/sqli_order_by/CMS-MS-SQLi-report.md

4) Credits

This vulnerability has been discovered and reported
by Riccardo Krauter researcher @ Soter IT Security (soteritsecurity.com).

5) Timeline

2021/02/22  Vendor was informed
2021/02/26  Vendor said he won't fix
2021/03/17  Public disclosure