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QCubed: Cross Site Scripting

Identifier: AIT-SA-20210215-03
Target: QCubed Framework
Vendor: QCubed
Version: all versions including 3.1.1
CVE: CVE-2020-24912
Accessibility: Remote
Severity: High
Author: Wolfgang Hotwagner (AIT Austrian Institute of Technology)


QCubed is a PHP Model-View-Controller Rappid Application Development framework.

Vulnerability Description

A reflected cross-site scripting (XSS) vulnerability in qcubed (all versions including 3.1.1) in profile.php via the stQuery-parameter allows unauthenticated attackers to steal sessions of authenticated users.

Proof Of Concept

The XSS occurs because the SQL-output is not sanitized properly. Since we are able to tamper the output using a SQL-injection(CVE-2020-24913), we can easily output a common XSS string.

We use the following payload(unencoded):

a:1:{i:0;a:3:{s:12:"objBacktrace";a:1:{s:4:"args";a:1:{i:0;s:3:"PWN";}}s:8:"strQuery";s:112:"select version(); select convert_from(decode($$PHNjcmlwdD5hbGVydCgneHNzJyk8L3NjcmlwdD4K$$,$$base64$$),$$utf-8$$)";s:11:"dblTimeInfo";s:1:"1";}}

PHNjcmlwdD5hbGVydCgneHNzJyk8L3NjcmlwdD4K is unencoded:


The following Burp-Screenshot illustrated a http-request using the payload from above:



The response indicates that the payload worked properly:



Vulnerable Versions

All versions including 3.1.1 are affected.

Tested Versions

QCubed 3.1.1


An unauthenticated attacker could  steal sessions of authenticated users.


A patch was delivered by QCubed that allows to disable the profile-functionality.


Vendor Contact Timeline

2020-04-19 Contacting the vendor
2020-04-19 Vendor replied
2020-05-01 Vendor released a patch at Github
2021-02-15 Public disclosure

Advisory URL