CVE-2023-47096 in Virtualmin
Summary
by MITRE • 11/01/2023
An issue was discovered in Virtualmin 7.7. The Cloudmin Services Client under System Settings allows XSS.
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Analysis
by VulDB Data Team • 02/20/2026
The vulnerability identified as CVE-2023-47096 resides within Virtualmin 7.7's Cloudmin Services Client component, specifically within the System Settings section of the web-based administration interface. This represents a cross-site scripting vulnerability that arises from insufficient input validation and output encoding mechanisms. The flaw manifests when user-supplied data is processed and subsequently rendered back to the browser without proper sanitization, creating an avenue for malicious actors to inject and execute arbitrary script code within the context of a victim's browser session.
This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically representing a reflected XSS attack vector. The technical implementation involves the application failing to properly encode or escape user-controllable input parameters before incorporating them into dynamically generated HTML content. When an attacker crafts malicious input and submits it through the Cloudmin Services Client interface, the application processes this input without adequate sanitization measures, allowing the injected script to execute in the victim's browser when the affected page is rendered. The vulnerability's impact is amplified by the privileged nature of the System Settings area, which typically requires administrative access and contains sensitive configuration data.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to hijack user sessions, steal authentication tokens, and potentially gain unauthorized access to critical system configurations. An attacker could exploit this vulnerability to perform actions such as modifying system settings, creating new user accounts, or even executing arbitrary commands on the server if the application lacks proper access controls. The reflected nature of the vulnerability means that the attack payload must be delivered through external means such as phishing emails or malicious links, making it particularly dangerous in targeted attack scenarios. Additionally, the vulnerability affects the Cloudmin Services Client component, which suggests potential impacts on cloud infrastructure management capabilities and could compromise the integrity of virtual server configurations.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's data processing pipeline. The primary defense involves sanitizing all user-supplied input through proper escaping techniques before rendering any data within HTML contexts, utilizing context-specific encoding methods such as HTML entity encoding for HTML content and JavaScript encoding for script contexts. Security headers including Content Security Policy should be implemented to limit the execution of unauthorized scripts, while input validation should enforce strict type checking and length restrictions on all user-controllable parameters. The application should also implement proper access controls and authentication mechanisms to limit the impact of potential exploitation, ensuring that only authorized administrators can access sensitive system settings. Organizations should also consider implementing web application firewalls and regular security scanning to detect and prevent exploitation attempts, while maintaining up-to-date vulnerability management practices to ensure prompt patch deployment when vendor fixes become available. This vulnerability aligns with ATT&CK technique T1059.007 for script-based attacks and T1566 for social engineering delivery methods.