CVE-2025-39349: CiyaShop Object Injection Vulnerability

CVE-2025-39349 Overview

CVE-2025-39349 is a PHP Object Injection vulnerability affecting the CiyaShop WordPress theme developed by Potenzaglobalsolutions. This insecure deserialization flaw allows attackers to inject malicious serialized objects into the application, potentially leading to remote code execution, data manipulation, or complete site compromise. The vulnerability stems from the application's failure to properly validate and sanitize serialized data before processing.

Critical Impact

Unauthenticated attackers can exploit this deserialization vulnerability to inject arbitrary PHP objects, potentially achieving remote code execution and complete WordPress site takeover without any user interaction.

Affected Products

• Potenzaglobalsolutions CiyaShop WordPress Theme versions up to and including 4.18.0
• All WordPress installations running vulnerable CiyaShop theme versions
• Sites using CiyaShop with exploitable PHP gadget chains present

Discovery Timeline

• 2025-05-19 - CVE-2025-39349 published to NVD
• 2025-05-29 - Last updated in NVD database

Technical Details for CVE-2025-39349

Vulnerability Analysis

This vulnerability is classified under CWE-502 (Deserialization of Untrusted Data). The CiyaShop theme improperly handles serialized PHP data, allowing attackers to craft malicious payloads that, when deserialized by the application, instantiate arbitrary objects with attacker-controlled properties.

PHP Object Injection vulnerabilities occur when user-supplied data is passed to the unserialize() function without adequate validation. When combined with "gadget chains" (classes with exploitable magic methods like __wakeup(), __destruct(), or __toString()), attackers can chain method calls to achieve various malicious outcomes including file operations, SQL queries, or remote code execution.

The network-accessible attack vector with no authentication requirements makes this vulnerability particularly dangerous for WordPress sites running the affected theme. Successful exploitation requires no user interaction and can be performed remotely by any unauthenticated attacker.

Root Cause

The root cause of CVE-2025-39349 is the unsafe use of PHP's unserialize() function on user-controllable input within the CiyaShop theme. The application fails to implement proper input validation, type checking, or allowlist restrictions on the classes that can be instantiated during deserialization.

When PHP unserializes data, it reconstructs objects from their serialized string representation. Without proper controls, an attacker can craft serialized strings that instantiate arbitrary classes present in the application's codebase or loaded libraries, with properties set to malicious values.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can exploit this vulnerability by:

1. Identifying an input vector that accepts serialized PHP data (form fields, cookies, or URL parameters)
2. Crafting a malicious serialized object payload targeting available gadget chains
3. Submitting the payload to the vulnerable endpoint
4. The application deserializes the malicious data, triggering the exploit chain

The exploitation typically involves leveraging existing PHP classes within WordPress core, the CiyaShop theme, or installed plugins that contain exploitable magic methods. Common exploitation targets include classes that perform file operations, execute system commands, or interact with the database.

For detailed technical analysis of this vulnerability, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-39349

Indicators of Compromise

• Unusual serialized data patterns in HTTP request logs containing PHP object notation (e.g., O: followed by class names)
• Web server access logs showing requests with encoded serialized payloads to CiyaShop theme endpoints
• Unexpected PHP objects or classes instantiated in application logs
• File system modifications or new files created in WordPress directories without administrative action

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block serialized PHP object patterns in incoming requests
• Implement runtime application monitoring to detect unexpected class instantiation during deserialization operations
• Configure intrusion detection systems to alert on known PHP object injection payload signatures
• Review HTTP request logs for base64-encoded or URL-encoded serialized object patterns

Monitoring Recommendations

• Enable detailed logging for all CiyaShop theme-related endpoints and monitor for anomalous request patterns
• Set up alerts for file integrity monitoring on WordPress core, theme, and plugin directories
• Monitor PHP error logs for deserialization-related errors or warnings that may indicate exploitation attempts
• Implement network traffic analysis to detect potential exfiltration or command-and-control communications following exploitation

How to Mitigate CVE-2025-39349

Immediate Actions Required

• Update the CiyaShop WordPress theme to a patched version beyond 4.18.0 immediately
• If no patch is available, consider temporarily disabling or replacing the CiyaShop theme with a secure alternative
• Deploy WAF rules to block requests containing serialized PHP object patterns
• Audit site for signs of compromise and restore from known-good backups if exploitation is suspected

Patch Information

Organizations using the CiyaShop theme should check with Potenzaglobalsolutions for security updates addressing this vulnerability. The affected versions include all releases from the initial version through 4.18.0. Users should update to the latest available version that includes a fix for this deserialization vulnerability.

For additional vulnerability details and patch status, consult the Patchstack WordPress Vulnerability Report.

Workarounds

• Implement WAF rules to filter and block serialized PHP data in HTTP requests targeting the WordPress installation
• Restrict access to WordPress admin and theme-related endpoints using IP allowlisting or VPN requirements
• Consider using PHP configuration options to limit classes available during deserialization (if application compatibility allows)
• Enable WordPress security plugins with object injection detection capabilities as an additional layer of defense

# Example WAF rule for blocking PHP serialized object patterns (ModSecurity)
SecRule REQUEST_BODY "@rx O:\d+:\"[^\"]+\":\d+:\{" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'PHP Object Injection attempt detected',\
    tag:'CVE-2025-39349'"