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The Ultimate Addons for Elementor (Formerly Elementor Header & Footer Builder) WordPress plugin before 2.5.0 does not sanitize SVG file contents when uploaded through the xmlrpc.php endpoint using base64 encode, leading to a Cross-Site Scripting vulnerability.

CVE-2025-9703 identifies a Cross-Site Scripting (XSS) vulnerability in the Ultimate Addons for Elementor WordPress plugin (formerly Elementor Header & Footer Builder) versions before 2.5.0. The vulnerability stems from improper sanitization of SVG file contents uploaded through the xmlrpc.php endpoint using base64 encoding. SVG files can contain embedded scripts or malicious payloads, and without proper sanitization, these scripts can execute in the context of the victim's browser when the SVG is rendered. The xmlrpc.php endpoint is a WordPress feature that allows remote procedure calls, often used for remote publishing or plugin interactions. Attackers can exploit this endpoint to upload crafted SVG files that contain malicious JavaScript. When an administrator or user views the SVG, the malicious script executes, leading to XSS attacks. Such attacks can result in cookie theft, session hijacking, defacement, or pivoting to other parts of the web application. Although no public exploits have been reported yet, the vulnerability is critical due to the widespread use of the plugin and the ease of exploitation without requiring user interaction beyond viewing the malicious content. The lack of a CVSS score indicates this is a newly disclosed issue, but the CWE-79 classification confirms the nature of the vulnerability. The plugin’s failure to sanitize SVG uploads via xmlrpc.php is a significant oversight, especially given the known risks associated with SVG files. This vulnerability affects all versions prior to 2.5.0, and no patch links are currently available, suggesting users must monitor for updates or implement workarounds.

Detailed information about CVE-2025-9703: CWE-79 Cross-Site Scripting (XSS) in Ultimate Addons for Elementor (Formerly Elementor Header & Footer Builder) affect

CVE-2025-9703: CWE-79 Cross-Site Scripting (XSS) in Ultimate Addons for Elementor (Formerly Elementor Header & Footer Builder) - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-9703: CWE-79 Cross-Site Scripting (XSS) in Ultimate Addons for Elementor (Formerly Elementor Header & Footer Builder)

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