CVE-2025-53990 is a high-severity vulnerability classified under CWE-502: Deserialization of Untrusted Data, affecting the JetFormBuilder plugin developed by jetmonsters. This vulnerability allows an attacker to perform object injection attacks by exploiting unsafe deserialization processes within JetFormBuilder versions up to 3.5.1.2. Deserialization vulnerabilities occur when untrusted data is processed and converted back into objects without proper validation or sanitization, enabling attackers to inject malicious objects that can alter application behavior. In this case, the vulnerability can lead to full compromise of confidentiality, integrity, and availability of the affected system. The CVSS v3.1 score is 7.2, indicating a high severity level, with an attack vector of network (AV:N), low attack complexity (AC:L), but requiring high privileges (PR:H) and no user interaction (UI:N). The scope is unchanged (S:U), but the impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H). Although no known exploits are currently in the wild, the vulnerability poses a significant risk due to the nature of object injection, which can enable remote code execution, privilege escalation, or data manipulation. JetFormBuilder is a WordPress plugin widely used for creating forms, and its compromise can lead to unauthorized access, data leakage, or disruption of web services. The absence of a patch link indicates that a fix may not yet be publicly available, emphasizing the need for immediate risk mitigation and monitoring.

For European organizations, the impact of CVE-2025-53990 can be substantial, especially for those relying on WordPress sites with JetFormBuilder installed. Exploitation can lead to unauthorized access to sensitive customer data, including personal identifiable information (PII), which is subject to strict GDPR regulations. A successful attack could result in data breaches, reputational damage, regulatory fines, and operational disruptions. The high integrity and availability impact means attackers could alter form data, inject malicious content, or cause denial of service, affecting business continuity. Organizations in sectors such as e-commerce, healthcare, finance, and government, which often use web forms for data collection, are particularly at risk. Additionally, the requirement for high privileges to exploit the vulnerability suggests that attackers may need to compromise an account first, but once achieved, the damage potential is severe. The lack of known exploits currently provides a window for proactive defense, but the risk of future exploitation remains high.

European organizations should immediately audit their WordPress environments to identify installations of JetFormBuilder, specifically versions up to 3.5.1.2. Until an official patch is released, it is advisable to disable or remove the plugin if it is not critical. For essential deployments, restrict access to the WordPress admin panel and plugin files using IP whitelisting and strong multi-factor authentication to mitigate the high privilege requirement. Implement web application firewalls (WAF) with custom rules to detect and block suspicious deserialization payloads or unusual POST requests targeting form endpoints. Regularly monitor logs for anomalous activities indicative of object injection attempts. Employ network segmentation to isolate web servers hosting vulnerable plugins from critical backend systems. Additionally, maintain up-to-date backups and test restoration procedures to minimize downtime in case of compromise. Engage with the vendor and security communities to obtain patches promptly once available and apply them in a timely manner. Finally, conduct security awareness training for administrators on the risks of plugin vulnerabilities and safe plugin management practices.