The vulnerability identified as CVE-2025-60083 affects the PDF Invoice Builder for WooCommerce plugin developed by add-ons.org, specifically versions up to and including 6.3.2. This vulnerability arises from unsafe deserialization of untrusted data, a common security flaw where an application deserializes data from an untrusted source without proper validation. In this case, the plugin processes serialized objects related to PDF invoice generation. An attacker can exploit this flaw by injecting malicious serialized objects, leading to object injection attacks. Such attacks can result in remote code execution, privilege escalation, or data manipulation depending on the context and the deserialized objects' capabilities. The vulnerability does not currently have a CVSS score, and no known exploits have been reported in the wild. However, the nature of deserialization vulnerabilities typically allows attackers to execute arbitrary code or disrupt application logic, making this a critical concern for affected systems. The plugin is widely used in WooCommerce environments to generate PDF invoices, making it a valuable target for attackers aiming to compromise e-commerce platforms. The vulnerability was reserved in September 2025 and published in December 2025, indicating recent discovery and disclosure. The lack of available patches at the time of reporting necessitates immediate attention to mitigate potential risks.

For European organizations, especially those operating e-commerce platforms using WooCommerce with the PDF Invoice Builder plugin, this vulnerability poses significant risks. Exploitation could lead to unauthorized code execution on web servers, allowing attackers to steal sensitive customer data, manipulate invoices, or disrupt business operations. This can result in financial losses, reputational damage, and regulatory non-compliance, particularly under GDPR requirements for data protection. The vulnerability affects the integrity and availability of invoicing processes, critical for business continuity. Since WooCommerce is widely adopted across Europe, especially in countries with strong e-commerce sectors like Germany, the UK, France, and the Netherlands, the impact could be widespread. Attackers could leverage this vulnerability to gain persistent access or pivot within compromised networks. The absence of known exploits currently provides a limited window for proactive defense, but the potential severity demands urgent mitigation efforts.

Organizations should immediately inventory their WooCommerce installations to identify the use of the PDF Invoice Builder plugin and its version. Until an official patch is released, consider disabling the plugin or restricting its functionality to trusted users and environments. Implement strict input validation and sanitization on all data processed by the plugin, especially serialized objects. Employ web application firewalls (WAFs) with rules to detect and block suspicious serialized payloads. Monitor logs for unusual deserialization activities or errors related to the plugin. Segregate the web server environment to limit the impact of potential exploitation. Once a patch is available, prioritize its deployment after testing in a controlled environment. Additionally, conduct security awareness training for developers and administrators on the risks of unsafe deserialization and secure coding practices. Regularly update and audit all third-party plugins to reduce exposure to similar vulnerabilities.