CVE-2025-39356 is a critical security vulnerability classified under CWE-502, which pertains to the deserialization of untrusted data. This vulnerability affects the Chimpstudio Foodbakery Sticky Cart plugin, specifically all versions up to 3.2. The issue arises when the application deserializes data from untrusted sources without proper validation or sanitization, allowing an attacker to perform object injection. Object injection can lead to remote code execution, privilege escalation, or arbitrary code execution within the context of the vulnerable application. The CVSS v3.1 base score is 9.8, indicating a critical severity with network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The vulnerability impacts confidentiality, integrity, and availability (C:H/I:H/A:H) of the affected systems. Although no known exploits are currently reported in the wild, the nature of the vulnerability and its ease of exploitation make it a significant threat. The absence of patches at the time of publication increases the urgency for mitigation. Deserialization vulnerabilities are particularly dangerous because they can allow attackers to craft malicious serialized objects that, when deserialized by the application, execute arbitrary code or manipulate application logic. Given that Foodbakery Sticky Cart is a plugin likely used in e-commerce or food ordering platforms, exploitation could lead to theft of sensitive customer data, manipulation of orders, or disruption of service.

For European organizations using the Foodbakery Sticky Cart plugin, this vulnerability poses a severe risk. Exploitation could lead to full system compromise, exposing sensitive customer information such as payment details, personal data, and order histories, which would violate GDPR regulations and result in significant legal and financial penalties. The integrity of e-commerce transactions could be undermined, leading to fraudulent orders or financial losses. Availability impacts could disrupt business operations, causing loss of revenue and customer trust. Given the criticality and ease of exploitation, attackers could automate attacks at scale, targeting multiple organizations simultaneously. This is especially concerning for small and medium enterprises in Europe that may rely on this plugin without robust security monitoring. Additionally, the reputational damage from a breach involving customer data could be substantial, affecting brand loyalty and market position.

European organizations should immediately audit their use of the Foodbakery Sticky Cart plugin to determine if they are running affected versions (up to 3.2). Until an official patch is released, organizations should consider disabling or removing the plugin to eliminate the attack surface. Implementing Web Application Firewalls (WAFs) with rules to detect and block malicious serialized payloads can provide interim protection. Monitoring application logs for unusual deserialization activity or unexpected object types is recommended. Organizations should also enforce strict input validation and sanitization on any data that is deserialized, if customization is possible. Segmentation of the web application environment and least privilege principles should be applied to limit the impact of a potential compromise. Regular backups and incident response plans should be updated to prepare for potential exploitation. Once a patch is available, prompt application of updates is critical. Additionally, organizations should educate developers and administrators about the risks of insecure deserialization and secure coding practices to prevent similar vulnerabilities.