CVE-2025-30618 is a critical security vulnerability identified in the yuliaz Rapyd Payment Extension for WooCommerce, specifically affecting versions up to 1.2.0. The vulnerability is classified under CWE-502, which pertains to Deserialization of Untrusted Data. This type of vulnerability occurs when an application deserializes data from untrusted sources without sufficient validation or sanitization, allowing an attacker to manipulate the serialized data to inject malicious objects. In this case, the Rapyd Payment Extension for WooCommerce improperly handles serialized input, enabling an attacker to perform Object Injection attacks. Such attacks can lead to remote code execution, privilege escalation, or complete compromise of the affected system. The CVSS v3.1 base score of 9.8 reflects the high severity of this vulnerability, with an attack vector that is network-based (AV:N), requiring no privileges (PR:N) and no user interaction (UI:N). The impact on confidentiality, integrity, and availability is rated as high (C:H/I:H/A:H), indicating that exploitation could lead to full system compromise, data theft, or service disruption. Although no known exploits are currently reported in the wild, the nature of the vulnerability and the critical CVSS score suggest that exploitation could be straightforward once a proof-of-concept is developed. The Rapyd Payment Extension is a plugin used within WooCommerce, a widely adopted e-commerce platform built on WordPress, which is popular among online retailers globally. Payment extensions are particularly sensitive components because they handle financial transactions and customer payment data, making them attractive targets for attackers seeking financial gain or to disrupt business operations. The lack of available patches at the time of publication further increases the urgency for organizations to implement mitigations and monitor for updates.

For European organizations, the impact of this vulnerability can be severe. WooCommerce is widely used by small to medium-sized enterprises (SMEs) and larger retailers across Europe for online sales, and payment extensions like Rapyd facilitate critical payment processing functions. Exploitation could lead to unauthorized access to payment data, including customer financial information, resulting in financial fraud, regulatory non-compliance (e.g., GDPR violations), and reputational damage. Additionally, attackers could leverage this vulnerability to execute arbitrary code on the web server, potentially pivoting to internal networks, stealing sensitive business data, or causing denial of service by disrupting e-commerce operations. The financial sector, retail, and any organization relying on WooCommerce with the Rapyd extension are at risk. Given the high severity and ease of exploitation, attackers could automate attacks at scale, impacting a broad range of businesses. The potential for data breaches also raises concerns about compliance with European data protection laws, which mandate strict controls on personal and payment data. Organizations could face significant fines and legal consequences if they fail to protect customer data adequately.

1. Immediate mitigation should involve disabling or uninstalling the Rapyd Payment Extension for WooCommerce until a security patch is released by the vendor. 2. Monitor official channels from yuliaz and WooCommerce for security updates or patches addressing CVE-2025-30618 and apply them promptly. 3. Implement Web Application Firewall (WAF) rules to detect and block suspicious serialized data patterns or unusual POST requests targeting the payment extension endpoints. 4. Conduct thorough input validation and sanitization on all serialized data inputs if custom code interacts with the plugin or payment data. 5. Restrict network access to the WooCommerce administration interface and payment processing endpoints using IP whitelisting or VPNs to reduce exposure. 6. Enable detailed logging and monitoring for anomalous activities related to the payment extension, including unexpected deserialization attempts or errors. 7. Perform regular security audits and penetration testing focusing on deserialization vulnerabilities and plugin security. 8. Educate development and IT teams about the risks of deserialization vulnerabilities and secure coding practices to prevent similar issues in custom plugins or extensions.