CVE-2025-3520 Overview
CVE-2025-3520 is an arbitrary file deletion vulnerability in the Avatar plugin for WordPress. The flaw affects all versions up to and including 0.1.4. The plugin fails to validate file paths in a deletion function, allowing authenticated users with Subscriber-level access or above to delete arbitrary files on the server.
Deletion of critical files such as wp-config.php can trigger WordPress reinstallation flows, enabling attackers to pivot toward remote code execution. The vulnerability is tracked under [CWE-22] (Improper Limitation of a Pathname to a Restricted Directory).
Critical Impact
Authenticated attackers with minimal privileges can delete arbitrary files on the server, leading to potential remote code execution when sensitive files like wp-config.php are removed.
Affected Products
- Avatar plugin for WordPress, all versions through 0.1.4
- WordPress sites with the Avatar plugin installed and active
- Any user role at Subscriber level or above can trigger the vulnerable code path
Discovery Timeline
- 2025-04-18 - CVE-2025-3520 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-3520
Vulnerability Analysis
The Avatar plugin exposes a file deletion routine that accepts user-controlled input without enforcing path constraints. The vulnerable code path is located in avatar.php around line 417, as referenced in the WordPress Plugin Code Review. Because the function does not validate or normalize the supplied path, attackers can supply directory traversal sequences to reach files outside the intended avatar directory.
An authenticated attacker can delete any file the web server process has permission to remove. Removing wp-config.php forces WordPress into a setup state, allowing the attacker to attach the site to a database under their control. From there, they can stage administrative access and execute PHP code, completing the path from file deletion to remote code execution.
The attack requires only Subscriber-level authentication, which is the default privilege level for self-registered users on many WordPress sites. This significantly lowers the barrier for exploitation on sites that allow open registration.
Root Cause
The root cause is insufficient file path validation [CWE-22]. The plugin function trusts the supplied filename or path parameter and passes it to a file deletion call without canonicalization or allow-list checks against the avatar upload directory.
Attack Vector
The attack vector is network-based and requires low-privilege authentication with no user interaction. An attacker authenticates as a Subscriber, then submits a crafted request to the Avatar plugin's deletion endpoint containing a path traversal payload that resolves to a target file such as wp-config.php.
No verified proof-of-concept code is published. Refer to the Wordfence Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-3520
Indicators of Compromise
- Unexpected deletion of wp-config.php, .htaccess, or other root-level WordPress files
- WordPress installation or setup screen appearing on a previously configured site
- HTTP POST requests to Avatar plugin endpoints containing ../ traversal sequences
- New administrator accounts created after suspicious file deletion activity
Detection Strategies
- Inspect web server access logs for requests to Avatar plugin handlers containing directory traversal patterns or absolute paths
- Monitor the WordPress installation directory for unexpected file deletions using file integrity monitoring
- Audit user registration logs for Subscriber accounts created shortly before file system anomalies
Monitoring Recommendations
- Enable file integrity monitoring on wp-config.php, .htaccess, and wp-content/plugins directories
- Alert on HTTP 200 responses to Avatar plugin POST requests originating from Subscriber-level sessions
- Track web shell indicators and unexpected PHP file creation following any file deletion alerts
How to Mitigate CVE-2025-3520
Immediate Actions Required
- Deactivate and remove the Avatar plugin from all WordPress installations until a patched release is verified
- Disable open user registration on WordPress sites that do not require it to reduce the authenticated attacker pool
- Audit existing Subscriber and higher-level accounts for unauthorized registrations
- Back up wp-config.php and other critical files to an out-of-band location
Patch Information
At the time of publication, no fixed version has been identified beyond 0.1.4. Site administrators should review the WordPress Avatar Plugin Page for an updated release and consult the Wordfence Vulnerability Report for remediation status.
Workarounds
- Remove the Avatar plugin entirely if a patched version is not available
- Restrict write and delete permissions on the WordPress filesystem for the web server user where feasible
- Place a web application firewall rule in front of the site to block requests containing ../ sequences targeting Avatar plugin endpoints
- Require email verification and CAPTCHA on registration to limit automated Subscriber account creation
# Disable the Avatar plugin via WP-CLI
wp plugin deactivate avatar
wp plugin delete avatar
# Disable open registration in wp-config.php or via WP-CLI
wp option update users_can_register 0
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
