CVE-2024-34452 is a cross-site scripting (XSS) vulnerability identified in CMSimple_XH version 1.7.6, a lightweight content management system. The vulnerability occurs due to insufficient sanitization of SVG (Scalable Vector Graphics) files uploaded to the system. SVG files can contain embedded scripts, and when a crafted SVG document is uploaded, malicious JavaScript code can be executed in the context of the victim’s browser when the SVG is rendered or processed. This vulnerability is classified under CWE-79, indicating a classic reflected or stored XSS issue. The CVSS v3.1 base score is 6.1, reflecting a medium severity level, with an attack vector of network (remote exploitation), low attack complexity, no privileges required, but requiring user interaction (such as viewing the malicious SVG). The scope is changed (S:C), meaning the vulnerability affects components beyond the initially vulnerable component, and the impact affects confidentiality (partial data disclosure) and availability (potential denial of service), but not integrity. No patches or fixes are currently linked, and no known exploits are reported in the wild. The vulnerability could be leveraged by attackers to steal session cookies, perform actions on behalf of authenticated users, or disrupt service availability by injecting malicious scripts via SVG uploads. Since SVG is a common vector for XSS due to its XML-based format supporting embedded scripts, the lack of proper sanitization in CMSimple_XH 1.7.6 represents a significant risk for websites using this CMS, especially if they allow user-generated content or file uploads without strict validation.

The primary impact of CVE-2024-34452 is the potential for attackers to execute arbitrary JavaScript in the browsers of users who view the malicious SVG content, leading to partial confidentiality loss through session hijacking or data leakage. Availability may also be impacted if the injected scripts disrupt normal website functionality or cause denial of service conditions. Integrity is not directly affected as the vulnerability does not allow modification of backend data. The ease of exploitation is relatively low complexity but requires user interaction, such as a victim visiting a page displaying the malicious SVG. Organizations running CMSimple_XH 1.7.6 with file upload features exposed to untrusted users or the public are at risk. This could lead to compromised user accounts, defacement, or disruption of services, impacting trust and operational continuity. However, the niche adoption of CMSimple_XH limits the widespread impact compared to more popular CMS platforms. Still, targeted attacks against specific organizations using this CMS could be damaging.

To mitigate CVE-2024-34452, organizations should implement strict validation and sanitization of all uploaded SVG files. This includes removing or disabling any embedded scripts or potentially dangerous XML elements within SVGs before processing or rendering. Employing a robust SVG sanitizer library designed to strip script elements and attributes is recommended. Additionally, restricting file upload permissions to trusted users and limiting the types of files accepted can reduce risk. Web application firewalls (WAFs) can be configured to detect and block malicious SVG payloads. Monitoring and logging upload activities for suspicious patterns is also advised. Since no official patch is currently available, organizations should consider disabling SVG uploads entirely or replacing CMSimple_XH with a more secure CMS if feasible. Educating users about the risks of interacting with untrusted content and ensuring browsers are up to date can provide additional defense layers.