CVE-2023-6541 in Allow SVG Plugin
Summary
by MITRE • 05/15/2025
The Allow SVG WordPress plugin before 1.2.0 does not sanitize uploaded SVG files, which could allow users with a role as low as Author to upload a malicious SVG containing XSS payloads.
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Analysis
by VulDB Data Team • 06/12/2025
The CVE-2023-6541 vulnerability affects the Allow SVG WordPress plugin version 1.2.0 and earlier, presenting a critical security risk through improper input validation and sanitization of uploaded SVG files. This flaw allows users with minimal privileges, specifically authors, to upload potentially malicious SVG content that could execute cross-site scripting attacks against other users of the WordPress site. The vulnerability stems from the plugin's failure to properly sanitize SVG file content before allowing its upload and subsequent execution within the web application context.
The technical flaw resides in the plugin's inadequate validation mechanisms for SVG file uploads, which do not adequately filter or sanitize potentially dangerous elements and attributes within SVG documents. SVG files, while useful for displaying scalable graphics, can contain embedded scripting capabilities through elements like script tags, event handlers, and embedded javascript that can execute when the file is rendered in a web browser. When the plugin fails to sanitize these files, it creates an environment where malicious actors can embed XSS payloads within SVG content that will execute when viewed by other users.
The operational impact of this vulnerability is significant as it lowers the attack surface for XSS exploitation from high-privilege roles to low-privilege author accounts. This means that any user with author-level permissions can potentially compromise the security of the entire WordPress site and its users. The vulnerability can be exploited to steal user sessions, redirect users to malicious sites, deface the website, or perform other malicious activities that could lead to further compromise of the system. The attack vector is particularly concerning because SVG files are commonly used for icons, logos, and other graphical elements on websites, making them a frequent upload target.
This vulnerability aligns with CWE-79, which describes Cross-Site Scripting flaws, and demonstrates how improper input validation can create security weaknesses in web applications. From an ATT&CK perspective, this represents a privilege escalation and initial access vector through the exploitation of insecure file upload mechanisms. The vulnerability also maps to the technique of malicious file upload, which is commonly used in web application attacks. Organizations should immediately update to version 1.2.0 or later of the Allow SVG plugin to remediate this issue, while also implementing additional security measures such as restricting file upload capabilities, implementing proper content security policies, and monitoring for unauthorized file uploads. The vulnerability underscores the importance of proper input sanitization and validation in web applications, particularly when dealing with file uploads that can contain executable content.