A PHP object injection bug in profile.php in qcubed (all versions including 3.1.1) unserializes the untrusted data of the POST-variable "strProfileData" and allows an unauthenticated attacker to execute code via a crafted POST request.
https://www.ait.ac.at/themen/cyber-security/pentesting/security-advisories/ait-sa-20210215-01
https://tech.feedyourhead.at/content/QCubed-PHP-Object-Injection-CVE-2020-24914
http://seclists.org/fulldisclosure/2021/Mar/28
http://packetstormsecurity.com/files/161758/QCubed-3.1.1-PHP-Object-Injection.html