CVE-2025-32652: Solace Extra File Upload Vulnerability

CVE-2025-32652 Overview

CVE-2025-32652 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) affecting the Solace Extra WordPress plugin developed by solacewp. This vulnerability allows attackers to upload malicious files to vulnerable WordPress installations, potentially leading to remote code execution and complete site compromise.

The vulnerability exists because the plugin fails to properly validate file types during upload operations, enabling attackers to bypass security controls and upload executable files such as PHP web shells directly to the server.

Critical Impact

Attackers can exploit this arbitrary file upload vulnerability to upload malicious PHP files, gaining remote code execution capabilities and full control over affected WordPress sites.

Affected Products

• Solace Extra WordPress Plugin versions from n/a through <= 1.3.1

Discovery Timeline

• 2025-04-17 - CVE-2025-32652 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-32652

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), a critical class of web application security flaws. The Solace Extra plugin for WordPress contains an arbitrary file upload vulnerability that allows malicious actors to upload files with dangerous extensions without proper validation.

When exploited, an attacker can upload a PHP web shell or other malicious script to the WordPress installation. Once uploaded, the attacker can access this file through a direct URL request, causing the server to execute the malicious code with the web server's privileges.

File upload vulnerabilities in WordPress plugins are particularly dangerous because WordPress installations often have broad file system permissions, and uploaded files may be accessible without authentication. This makes the vulnerability an attractive target for automated exploitation tools and threat actors seeking to establish persistent access to compromised websites.

Root Cause

The root cause of this vulnerability is insufficient file type validation in the Solace Extra plugin's file upload handling functionality. The plugin fails to implement adequate server-side checks to verify that uploaded files are of an expected, safe file type. This allows attackers to bypass any client-side restrictions and upload files with executable extensions such as .php, .phtml, or other server-executable formats.

Proper file upload security requires multiple layers of validation including file extension whitelisting, MIME type verification, content inspection, and secure file storage outside the web root when possible.

Attack Vector

The attack vector involves sending a crafted HTTP request to the vulnerable file upload endpoint with a malicious file payload. The exploitation process typically follows these steps:

1. The attacker identifies a WordPress site running a vulnerable version of the Solace Extra plugin
2. The attacker crafts a malicious PHP file (such as a web shell) disguised or submitted through the vulnerable upload functionality
3. The file is uploaded to the server, bypassing inadequate validation checks
4. The attacker accesses the uploaded malicious file via direct URL
5. The web server executes the PHP code, granting the attacker remote command execution

The vulnerability does not require authentication in typical scenarios, making it exploitable by unauthenticated remote attackers over the network.

Detection Methods for CVE-2025-32652

Indicators of Compromise

• Unexpected PHP files appearing in WordPress upload directories (typically wp-content/uploads/)
• Unusual files with suspicious naming patterns or obfuscated content in plugin directories
• Web server access logs showing requests to unfamiliar PHP files in upload or plugin directories
• Evidence of web shell activity such as command execution patterns in server logs
• New or modified files with recent timestamps in plugin or upload directories

Detection Strategies

• Implement file integrity monitoring (FIM) on WordPress directories to detect unauthorized file additions
• Monitor HTTP POST requests to plugin endpoints that may handle file uploads
• Scan upload directories regularly for PHP files or other executable content
• Deploy web application firewalls (WAF) with rules to block malicious file upload attempts
• Review server logs for access patterns indicative of web shell usage

Monitoring Recommendations

• Enable detailed access logging on the web server to capture all requests to WordPress directories
• Set up alerts for new file creation events in sensitive WordPress directories
• Monitor for unusual outbound network connections from the web server that may indicate backdoor activity
• Implement runtime application self-protection (RASP) to detect and block malicious file execution
• Regularly audit WordPress plugin versions and compare against known vulnerable versions

How to Mitigate CVE-2025-32652

Immediate Actions Required

• Update the Solace Extra plugin immediately to a patched version if available from the vendor
• If no patch is available, consider disabling or removing the Solace Extra plugin until a fix is released
• Audit your WordPress uploads and plugin directories for any suspicious or unexpected files
• Review web server access logs for signs of exploitation attempts or successful compromises
• Implement additional file upload restrictions at the web server or WAF level

Patch Information

Organizations should check the Patchstack Vulnerability Report for the latest patch information and remediation guidance. Monitor the official solacewp plugin repository for updated versions that address this vulnerability.

Workarounds

• Restrict file upload functionality through web server configuration by denying execution of PHP files in upload directories
• Implement a WAF rule to block file uploads with dangerous extensions to affected endpoints
• Use WordPress security plugins that provide additional file upload validation and monitoring
• Restrict plugin directory permissions to prevent unauthorized file creation
• Consider implementing an allowlist of permitted file types at the server configuration level

# Apache configuration to prevent PHP execution in uploads directory
# Add to .htaccess in wp-content/uploads/
<FilesMatch "\.(?:php|phtml|php3|php4|php5|php7|phps)$">
    Require all denied
</FilesMatch>

# Nginx configuration equivalent
# Add to server block configuration
location ~* /wp-content/uploads/.*\.php$ {
    deny all;
}