CVE-2017-20288 in QCubed
Summary
by MITRE • 10/22/2026
QCubed 2.2.0 through 3.1.1 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the installation_path parameter. Attackers can craft GET requests to /assets/php/_devtools/installer/step_2.php with malicious installation_path values echoed unescaped, executing JavaScript in victims' browsers. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-20.
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Analysis
by VulDB Data Team • 10/22/2026
QCubed versions ranging from 2.2.0 through 3.1.1 are susceptible to a reflected cross-site scripting vulnerability within their web application interface, specifically targeting the installation utility component. This security flaw arises because the software fails to properly sanitize user-supplied input before including it in HTTP responses. The specific point of failure is located at the endpoint /assets/php/_devtools/installer/step_2.php, where the installation_path parameter is processed without adequate validation or encoding mechanisms. When an attacker crafts a malicious GET request containing script payloads within this parameter, the server echoes the unescaped input directly back to the client browser. This behavior allows for the immediate execution of arbitrary JavaScript code in the context of the victim's session, bypassing standard security controls such as the same-origin policy and enabling potential data theft or session hijacking attacks against users who interact with these crafted links.
The operational impact of this vulnerability is significant due to its unauthenticated nature, meaning that any internet-facing instance of QCubed can be targeted without prior access credentials. The exploitation vector relies on social engineering techniques where an attacker distributes a malicious URL containing the injected script payload via email or other communication channels. Upon clicking the link, the victim's browser processes the response from the server and executes the embedded JavaScript code. This execution occurs within the security context of the QCubed application domain, granting the attacker potential access to sensitive information stored in cookies, local storage, or session variables associated with that domain. Furthermore, if the user has administrative privileges on the QCubed platform, the impact escalates severely as the injected script could perform actions such as modifying configuration files, creating new admin accounts, or exfiltrating database contents directly from the victim's browser environment.
This vulnerability aligns closely with CWE-79, which classifies improper neutralization of input during web page generation known as cross-site scripting. The specific mechanism observed involves reflected XSS where the malicious payload is not stored on the server but rather returned immediately in the response to a single request. In terms of offensive security frameworks, this exploitation technique maps to MITRE ATT&CK tactic T1059, specifically sub-technique 007 for JavaScript execution. The initial observation of active exploitation by the Shadowserver Foundation on October 20, 2023, indicates that threat actors are actively scanning and leveraging this flaw in the wild. This real-world activity underscores the urgency for organizations running affected versions to prioritize remediation efforts immediately rather than treating it as a theoretical risk.
Mitigation strategies should focus primarily on upgrading the QCubed software to version 3.1.2 or later, where the developers have presumably implemented proper input validation and output encoding practices to neutralize script injection attempts. For environments where an immediate upgrade is not feasible due to compatibility constraints or operational downtime requirements, temporary compensating controls must be deployed at the network perimeter. Web Application Firewalls can be configured with specific rulesets to detect and block HTTP requests containing common JavaScript payload patterns within query parameters targeting the identified endpoint. Additionally, implementing strict Content Security Policy headers that restrict script execution sources can significantly reduce the impact of successful exploitation by preventing inline scripts from running even if they are injected into the page response. Regular security audits and code reviews focusing on input handling in development tools should also be conducted to prevent similar flaws in future releases or custom modifications.