CVE-2025-23932: Quick Count Object Injection Vulnerability

CVE-2025-23932 Overview

CVE-2025-23932 is a critical Insecure Deserialization vulnerability affecting the Quick Count WordPress plugin. The vulnerability allows attackers to exploit PHP Object Injection through deserialization of untrusted data, potentially leading to remote code execution, data exfiltration, or complete site compromise. This issue affects Quick Count plugin versions through 3.00.

Critical Impact

Unauthenticated attackers can exploit this PHP Object Injection vulnerability to execute arbitrary code, manipulate application data, or gain unauthorized access to WordPress installations running vulnerable versions of the Quick Count plugin.

Affected Products

• Quick Count WordPress Plugin versions through 3.00
• WordPress installations with the Quick Count plugin enabled
• Web servers hosting affected WordPress sites

Discovery Timeline

• January 22, 2025 - CVE-2025-23932 published to NVD
• January 22, 2025 - Last updated in NVD database

Technical Details for CVE-2025-23932

Vulnerability Analysis

This vulnerability stems from improper handling of serialized PHP data within the Quick Count WordPress plugin. When the application deserializes user-controlled input without adequate validation, it creates an opportunity for attackers to inject malicious PHP objects. The deserialization process reconstructs these objects in memory, and if the application contains classes with dangerous magic methods (such as __wakeup(), __destruct(), or __toString()), an attacker can chain these methods to achieve arbitrary code execution.

The network-accessible nature of this vulnerability means that remote attackers can exploit it without requiring authentication or user interaction. This significantly increases the risk profile for WordPress sites running the affected plugin, as the attack surface is exposed to the entire internet.

Root Cause

The root cause of CVE-2025-23932 is the use of PHP's unserialize() function on untrusted input without proper validation or sanitization. The Quick Count plugin fails to implement necessary security controls before deserializing data, allowing attackers to craft malicious serialized strings that instantiate arbitrary PHP objects. When combined with existing classes in the WordPress ecosystem that have exploitable magic methods, this creates a "gadget chain" that attackers can leverage for malicious purposes.

Attack Vector

The attack exploits the network-accessible deserialization endpoint in the Quick Count plugin. An attacker crafts a malicious serialized PHP object containing a payload designed to trigger code execution when deserialized. The attack flow involves:

1. Identifying the vulnerable deserialization point in the Quick Count plugin
2. Analyzing available PHP classes in the WordPress installation for exploitable magic methods
3. Constructing a serialized payload that chains these methods to achieve the desired malicious outcome
4. Sending the crafted payload to the vulnerable endpoint
5. Upon deserialization, the malicious object is reconstructed and the gadget chain executes

The exploitation does not require authentication, making it particularly dangerous for publicly accessible WordPress installations. For detailed technical information, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-23932

Indicators of Compromise

• Unexpected PHP serialized data in web server access logs, particularly containing class names or object references
• Unusual outbound network connections from the WordPress server
• New or modified files in the WordPress installation directory, especially PHP files with obfuscated code
• Unexpected user accounts or privilege changes in WordPress admin panel
• Web application firewall logs showing serialized PHP payloads in request parameters

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block serialized PHP objects in incoming requests
• Monitor server logs for requests containing serialized data patterns (e.g., O:, a:, s: prefixes)
• Deploy file integrity monitoring to detect unauthorized changes to WordPress core files and plugins
• Use WordPress security plugins that scan for known vulnerability signatures
• Implement network-based intrusion detection systems (IDS) with signatures for PHP object injection attacks

Monitoring Recommendations

• Enable detailed logging for all HTTP requests to WordPress installations
• Configure alerts for unusual process spawning from web server processes (Apache, Nginx, PHP-FPM)
• Monitor for suspicious outbound connections from WordPress servers, especially to unknown IP addresses
• Implement real-time log analysis for patterns associated with deserialization attacks
• Set up file system monitoring for the wp-content/plugins/quick-count/ directory

How to Mitigate CVE-2025-23932

Immediate Actions Required

• Immediately disable or remove the Quick Count plugin from all WordPress installations until a patched version is available
• Audit WordPress installations for signs of compromise, including unexpected files or database modifications
• Review web server access logs for exploitation attempts targeting the Quick Count plugin
• Implement WAF rules to block serialized PHP data in incoming requests
• Restrict network access to WordPress admin interfaces to trusted IP ranges

Patch Information

As of the publication date, users should monitor the Patchstack WordPress Vulnerability Report for updates regarding patches from the plugin developer. Until an official patch is released, the recommended action is to deactivate and remove the Quick Count plugin from WordPress installations.

Organizations should implement a vulnerability management process to track when patches become available and deploy them promptly. Contact the plugin developer or WordPress plugin repository for the latest security updates.

Workarounds

• Deactivate and delete the Quick Count plugin until a security patch is released
• Implement WAF rules to filter and block requests containing serialized PHP objects
• Use WordPress security plugins like Wordfence or Sucuri to add an additional layer of protection
• Consider using alternative counting/analytics plugins that do not have known vulnerabilities
• Isolate WordPress installations on separate network segments to limit potential damage from exploitation

# WordPress CLI commands to disable and remove the vulnerable plugin
wp plugin deactivate quick-count --path=/var/www/html/wordpress
wp plugin delete quick-count --path=/var/www/html/wordpress

# Verify the plugin has been removed
wp plugin list --path=/var/www/html/wordpress | grep quick-count