CVE-2023-48202 in Sunlight
Summary
by MITRE • 01/27/2024
Cross-Site Scripting (XSS) vulnerability in Sunlight CMS 8.0.1 allows an authenticated low-privileged user to escalate privileges via a crafted SVG file in the File Manager component.
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Analysis
by VulDB Data Team • 05/30/2025
This vulnerability represents a critical cross-site scripting flaw in Sunlight CMS version 8.0.1 that enables privilege escalation through a malicious SVG file upload. The vulnerability exists within the File Manager component where the application fails to properly sanitize user-uploaded SVG files, allowing malicious code execution in the context of other users' sessions. The flaw specifically affects authenticated users with low privileges who can leverage this weakness to gain elevated access rights within the CMS environment. This type of vulnerability falls under CWE-79 which describes cross-site scripting flaws where untrusted data is improperly incorporated into web pages without proper validation or encoding. The attack vector demonstrates how a seemingly benign file upload functionality can be exploited to bypass normal access controls and escalate privileges.
The technical implementation of this vulnerability occurs when an authenticated user uploads a crafted SVG file containing malicious javascript code within the SVG tags. The CMS application processes this file without adequate sanitization, allowing the embedded script to execute when the file is subsequently viewed or processed by other users. This creates a persistent XSS condition that can be leveraged to steal session cookies, modify user permissions, or redirect victims to malicious sites. The vulnerability is particularly dangerous because it requires minimal privileges to exploit, making it an attractive target for attackers seeking to establish persistent access within the CMS. According to ATT&CK framework, this represents a privilege escalation technique through malicious file upload and code injection.
The operational impact of this vulnerability extends beyond simple XSS exploitation as it enables attackers to effectively bypass authentication mechanisms and gain unauthorized access to administrative functions. Once the malicious SVG file is uploaded and processed, any user who views the file or interacts with it in the CMS environment becomes vulnerable to the injected payload. This creates a chain reaction where the initial low-privileged user can potentially compromise multiple accounts and escalate their access level to administrator status. The vulnerability also poses risks to data integrity and confidentiality as attackers can manipulate content, steal sensitive information, or modify the CMS configuration. Organizations using Sunlight CMS 8.0.1 are particularly at risk since the vulnerability affects the core file management functionality that is essential for content management operations.
Mitigation strategies for this vulnerability should include immediate patching of the Sunlight CMS to version 8.0.2 or later where the file sanitization issues have been addressed. Organizations should implement strict file validation mechanisms that reject SVG files containing potentially dangerous elements or attributes. The implementation of Content Security Policy headers can provide additional protection against XSS attacks by restricting script execution within the application. Regular security auditing of file upload components and input validation routines should be conducted to prevent similar vulnerabilities from emerging in the future. Network monitoring and intrusion detection systems should be configured to detect anomalous file upload activities and potential exploitation attempts. The vulnerability also highlights the importance of principle of least privilege implementation where file upload capabilities are restricted to only users who require such functionality, reducing the attack surface available to malicious actors.