CVE-2025-14564 in Viable URL Media Uploader Plugin
Summary
by MITRE • 09/30/2026
The Viable URL Media Uploader plugin for WordPress is vulnerable to Stored Cross-Site Scripting via SVG File uploads in all versions up to, and including, 1.0.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses the SVG file.
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Analysis
by VulDB Data Team • 09/30/2026
The Viable URL Media Uploader plugin for WordPress contains a critical security flaw affecting all versions up to and including 1.0.0. This vulnerability stems from insufficient input sanitization and output escaping mechanisms when handling uploaded files, specifically targeting Scalable Vector Graphics (SVG) formats. SVG files are XML-based vector image definitions that can contain executable JavaScript code within their structure. Because the plugin fails to adequately validate or sanitize these uploads, it allows malicious actors to bypass standard security controls designed to prevent script execution in web browsers.
The technical nature of this flaw is classified as a Stored Cross-Site Scripting vulnerability. Unlike reflected XSS where the payload is delivered via a link, stored XSS involves persisting the malicious code on the target server. In this specific case, an attacker uploads a crafted SVG file containing embedded JavaScript payloads. When other users or administrators view media items that reference this uploaded file, their browsers interpret and execute the injected scripts in the context of the vulnerable website. This persistence means the attack does not require social engineering to trick a user into clicking a unique link; simply accessing pages where the malicious image is displayed triggers the exploit.
The operational impact of this vulnerability is significant due to the required privilege level for exploitation. The flaw requires authenticated attackers with Author-level access or higher to initiate the upload process. While this restricts immediate abuse by unauthenticated users, it poses a severe risk in environments where multiple contributors have elevated permissions. An attacker gaining such access can compromise not only their own session but also any user who views content containing the malicious SVG file. This can lead to account hijacking through cookie theft, defacement of web pages, redirection to phishing sites, or further malware distribution within the organization's network perimeter.
From a classification perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific mechanism involving SVG files highlights the dangers of allowing complex file types without rigorous validation against executable content patterns. In terms of offensive security frameworks, this attack vector corresponds to ATT&CK technique T1059, Command and Scripting Interpreter, specifically through web browser scripting languages like JavaScript. It also relates to T1189, Drive-by Client Side Execution, as the payload executes automatically upon viewing rather than requiring explicit user interaction beyond navigation.
Mitigation strategies should focus on immediate remediation of the software defect alongside broader security hygiene practices. The most effective solution is to update the Viable URL Media Uploader plugin to a version where this vulnerability has been patched by the developers. If an update is not immediately available, administrators should restrict file upload types to exclude SVG or implement strict server-side validation that strips all script tags and event handlers from uploaded XML files before storage. Additionally, implementing Content Security Policy headers can help mitigate the impact of any successful XSS attempts by restricting the sources from which scripts are allowed to execute. Regular audits of user permissions ensure that only trusted individuals have Author-level access, reducing the attack surface for this specific privilege-dependent flaw.