CVE-2025-30618: Rapyd Payment WooCommerce Plugin Flaw

CVE-2025-30618 Overview

A critical PHP Object Injection vulnerability has been identified in the Rapyd Payment Extension for WooCommerce WordPress plugin. This vulnerability stems from insecure deserialization of untrusted data, allowing unauthenticated attackers to inject arbitrary PHP objects into the application. When exploited, this can lead to remote code execution, unauthorized data access, or complete system compromise.

Critical Impact

Unauthenticated attackers can exploit this PHP Object Injection vulnerability to potentially achieve remote code execution, bypass security controls, and compromise WordPress installations running the affected plugin.

Affected Products

• Rapyd Payment Extension for WooCommerce versions up to and including 1.2.0
• WordPress installations utilizing the vulnerable plugin
• WooCommerce stores integrated with Rapyd payment processing

Discovery Timeline

• 2025-06-17 - CVE-2025-30618 published to NVD
• 2025-06-17 - Last updated in NVD database

Technical Details for CVE-2025-30618

Vulnerability Analysis

This vulnerability is classified as CWE-502 (Deserialization of Untrusted Data). PHP Object Injection occurs when user-controllable data is passed to PHP's unserialize() function without proper validation. In the context of the Rapyd Payment Extension for WooCommerce, malicious actors can craft serialized PHP objects that, when deserialized by the application, trigger dangerous "magic methods" such as __wakeup(), __destruct(), or __toString().

The attack requires no authentication and can be executed remotely over the network with low complexity. Successful exploitation can result in complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of this vulnerability lies in the improper handling of serialized data within the Rapyd Payment Extension. The plugin fails to adequately validate or sanitize input before passing it to deserialization functions. When combined with suitable "gadget chains" present in WordPress core, WooCommerce, or other installed plugins, attackers can chain object instantiations to achieve arbitrary code execution.

This type of vulnerability is particularly dangerous in the WordPress ecosystem due to the widespread availability of known gadget chains that can be leveraged for exploitation.

Attack Vector

The vulnerability is exploitable via network-based attacks without requiring any user interaction or prior authentication. An attacker can send specially crafted HTTP requests containing malicious serialized PHP objects to the vulnerable endpoint.

The attack chain typically follows this pattern:

1. The attacker identifies the vulnerable Rapyd Payment Extension installation
2. A malicious serialized PHP object payload is crafted using known WordPress/WooCommerce gadget chains
3. The payload is submitted to the application through a vulnerable parameter
4. The application deserializes the untrusted data, instantiating the attacker-controlled objects
5. Magic methods within the object chain execute, leading to arbitrary code execution or other malicious outcomes

For detailed technical information about this vulnerability, refer to the Patchstack Security Advisory.

Detection Methods for CVE-2025-30618

Indicators of Compromise

• Unusual HTTP POST requests to WooCommerce payment endpoints containing serialized PHP data patterns (e.g., O:, a:, s: sequences)
• Unexpected PHP processes spawning from web server contexts
• Web server logs showing requests with encoded or obfuscated serialized object payloads
• Newly created files in web-accessible directories or plugin folders
• Unauthorized modifications to WordPress configuration files or database entries

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing PHP serialized object patterns
• Deploy endpoint detection solutions that monitor for suspicious PHP process behavior and file system modifications
• Enable comprehensive logging on WordPress installations to capture detailed request data for forensic analysis
• Utilize security plugins that scan for known vulnerable plugin versions and alert on outdated components

Monitoring Recommendations

• Monitor web server access logs for anomalous requests targeting WooCommerce payment processing endpoints
• Set up alerts for any modifications to critical WordPress files including wp-config.php and plugin directories
• Track plugin version inventory and establish automated vulnerability scanning schedules
• Monitor for unexpected outbound network connections from the web server that may indicate post-exploitation activity

How to Mitigate CVE-2025-30618

Immediate Actions Required

• Immediately update the Rapyd Payment Extension for WooCommerce to a patched version if available
• If no patch is available, consider temporarily disabling the plugin until a fix is released
• Review web server logs for signs of exploitation attempts targeting this vulnerability
• Implement WAF rules to block serialized PHP object payloads in HTTP requests
• Conduct a security audit of the WordPress installation to identify any signs of compromise

Patch Information

Organizations should check the official WordPress plugin repository and the vendor's website for security updates addressing this vulnerability. Monitor the Patchstack Security Advisory for updated remediation guidance.

Until an official patch is available, implementing the workarounds below is strongly recommended to reduce exposure.

Workarounds

• Disable the Rapyd Payment Extension plugin if it is not actively required for business operations
• Implement strict input validation at the web server or WAF level to reject requests containing serialized PHP data
• Restrict access to WooCommerce admin and payment endpoints to trusted IP addresses where feasible
• Enable WordPress file integrity monitoring to detect unauthorized modifications
• Consider switching to an alternative payment gateway plugin until the vulnerability is addressed

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate rapyd-payments --path=/var/www/html/wordpress

# Verify the plugin is deactivated
wp plugin list --path=/var/www/html/wordpress | grep rapyd