CVE-2025-3520 in Avatar Plugin
Summary
by MITRE • 04/18/2025
The Avatar plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in a function in all versions up to, and including, 0.1.4. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php).
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 04/18/2025
The Avatar plugin for WordPress presents a critical security vulnerability that stems from inadequate input validation within its file handling mechanisms. This weakness exists in all versions up to and including 014 and represents a severe privilege escalation risk that can be exploited by authenticated attackers possessing subscriber-level access or higher. The vulnerability manifests through a function that fails to properly validate file paths, creating an avenue for malicious users to manipulate the system's file operations.
The technical flaw resides in the plugin's inability to sanitize and validate file path inputs before executing deletion operations. When an authenticated user with subscriber privileges attempts to delete files through the vulnerable function, the system does not adequately verify the legitimacy of the requested file paths. This lack of proper validation allows attackers to construct malicious file paths that can traverse directory structures and target sensitive system files. The vulnerability is classified as a path traversal issue that aligns with common weakness enumerations such as CWE-22 Path Traversal and CWE-77 Path Traversal.
The operational impact of this vulnerability extends far beyond simple file deletion capabilities. Attackers can leverage this weakness to remove critical system files including wp-config.php which contains database credentials and cryptographic keys essential for WordPress operation. When such fundamental configuration files are deleted, the consequences can range from complete site compromise to potential remote code execution opportunities. The attacker's ability to target specific files within the WordPress installation directory structure creates multiple attack vectors that can be exploited to gain deeper system access.
This vulnerability directly maps to several tactics and techniques outlined in the ATT&CK framework under privilege escalation and persistence categories. Specifically, it enables an attacker to move laterally within a WordPress environment by removing critical configuration files and potentially installing backdoors or other malicious components. The attack surface expands significantly when considering that WordPress installations often contain numerous plugins and themes that may be vulnerable to similar path traversal issues.
Security practitioners should implement immediate mitigations including updating to the latest available version of the Avatar plugin once patched, implementing strict file access controls, and monitoring for unauthorized file deletion activities. Network-based intrusion detection systems should be configured to alert on suspicious file operations within WordPress directories. Additionally, administrators should consider implementing web application firewalls that can detect and block path traversal attempts before they reach the vulnerable plugin functions. The vulnerability underscores the importance of proper input validation and access control mechanisms in web applications, particularly those handling user-generated content or file operations.
Organizations running WordPress installations must conduct thorough security assessments to identify other plugins or themes that may exhibit similar vulnerabilities. The presence of this flaw highlights the critical need for comprehensive security testing including static code analysis and dynamic application security testing to identify potential path traversal issues. Regular security audits should include verification of file operation functions within all installed plugins to ensure proper input validation and sanitization practices are implemented throughout the entire WordPress ecosystem.