CVE-2025-47532: CoinPayments WooCommerce Gateway Flaw

CVE-2025-47532 Overview

CVE-2025-47532 is a critical PHP Object Injection vulnerability affecting the CoinPayments.net Payment Gateway for WooCommerce plugin. This insecure deserialization flaw allows unauthenticated attackers to inject malicious serialized objects into the application, potentially leading to remote code execution, unauthorized data access, or complete system compromise. The vulnerability arises from improper handling of untrusted data during the deserialization process within the WordPress plugin.

Critical Impact

Unauthenticated attackers can exploit this PHP Object Injection vulnerability to execute arbitrary code, access sensitive payment data, or take full control of affected WordPress/WooCommerce installations.

Affected Products

• CoinPayments.net Payment Gateway for WooCommerce versions through 1.0.17
• WordPress installations with vulnerable CoinPayments plugin versions
• WooCommerce stores using CoinPayments cryptocurrency payment processing

Discovery Timeline

• 2025-05-23 - CVE-2025-47532 published to NVD
• 2025-05-23 - Last updated in NVD database

Technical Details for CVE-2025-47532

Vulnerability Analysis

This vulnerability is classified as CWE-502 (Deserialization of Untrusted Data), a dangerous weakness that occurs when an application deserializes data from untrusted sources without proper validation. In PHP applications like WordPress plugins, this typically manifests through the unserialize() function being called on user-controllable input.

When exploited, PHP Object Injection vulnerabilities can lead to a variety of severe impacts depending on the classes available in the application's codebase. Attackers can leverage existing class methods (known as "gadget chains") to perform actions such as arbitrary file operations, SQL injection, or direct code execution through magic methods like __wakeup(), __destruct(), or __toString().

The network-accessible nature of this vulnerability, combined with the lack of authentication requirements, makes it particularly dangerous for e-commerce sites processing cryptocurrency payments. The vulnerability affects all versions of the CoinPayments.net Payment Gateway for WooCommerce from the initial release through version 1.0.17.

Root Cause

The root cause of CVE-2025-47532 is the unsafe deserialization of user-supplied data within the CoinPayments WooCommerce plugin. The plugin fails to properly validate or sanitize serialized data before passing it to PHP's unserialize() function. This allows attackers to craft malicious serialized payloads that, when deserialized, instantiate arbitrary objects with attacker-controlled properties, potentially triggering dangerous behaviors through PHP magic methods.

Attack Vector

The attack vector for this vulnerability is network-based, requiring no authentication or user interaction. An attacker can craft a malicious HTTP request containing a specially constructed serialized PHP object. When the vulnerable plugin processes this request and deserializes the payload, the attacker's code or gadget chain is executed within the context of the WordPress application.

The exploitation process typically involves:

1. Identifying available PHP classes in the WordPress/WooCommerce environment that contain exploitable magic methods
2. Constructing a Property Oriented Programming (POP) chain using these classes
3. Serializing the malicious object payload
4. Sending the payload to the vulnerable endpoint
5. The application deserializes the payload, triggering the gadget chain and executing the attacker's intended actions

Due to the nature of WordPress and WooCommerce, attackers have access to a rich ecosystem of classes that may contain suitable gadgets for exploitation. For detailed technical analysis, refer to the Patchstack vulnerability disclosure.

Detection Methods for CVE-2025-47532

Indicators of Compromise

• Unusual HTTP requests containing serialized PHP data (strings beginning with O:, a:, or similar serialization markers) targeting WooCommerce payment endpoints
• Unexpected file modifications or new files appearing in WordPress directories, particularly in wp-content/uploads/ or plugin directories
• Anomalous outbound network connections from the web server to unknown external hosts
• Suspicious PHP error logs indicating deserialization failures or class instantiation errors

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing PHP serialized object patterns
• Monitor WordPress access logs for unusual POST requests to CoinPayments plugin endpoints containing serialized data
• Deploy file integrity monitoring to detect unauthorized modifications to WordPress core, plugin, and theme files
• Enable and review PHP error logging for deserialization-related warnings and errors

Monitoring Recommendations

• Configure real-time alerting for any requests matching PHP serialization patterns (O:[0-9]+:", a:[0-9]+:{)
• Establish baseline behavior for CoinPayments payment processing and alert on deviations
• Monitor database queries originating from the CoinPayments plugin for suspicious patterns
• Implement network egress monitoring to detect potential reverse shells or data exfiltration attempts

How to Mitigate CVE-2025-47532

Immediate Actions Required

• Update the CoinPayments.net Payment Gateway for WooCommerce plugin to the latest patched version immediately
• If an update is not available, consider temporarily disabling the CoinPayments plugin until a patch is released
• Review WordPress and web server access logs for signs of exploitation attempts
• Conduct a thorough security audit of the WordPress installation including file integrity verification

Patch Information

Organizations should update to a patched version of the CoinPayments.net Payment Gateway for WooCommerce plugin as soon as one becomes available. Monitor the official WordPress plugin repository and the Patchstack security advisory for patch release announcements. Until a patch is applied, implement the workarounds described below to reduce risk exposure.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to block requests containing PHP serialized object patterns
• Implement PHP's allowed_classes parameter in unserialize() calls at the application level if direct code modification is possible
• Restrict network access to WordPress admin and payment processing endpoints to trusted IP ranges
• Enable WordPress security plugins that provide object injection protection and input sanitization

# Example ModSecurity rule to detect PHP object injection attempts
SecRule REQUEST_BODY "@rx O:[0-9]+:\"[a-zA-Z_][a-zA-Z0-9_]*\"" \
    "id:100001,phase:2,deny,status:403,log,msg:'PHP Object Injection Attempt Detected'"