CVE-2025-8963 is a medium severity vulnerability affecting jeecgboot's JimuReport product, specifically versions 2.1.0 and 2.1.1. The vulnerability arises from unsafe deserialization within the Data Large Screen Template component, particularly in the functionality exposed by the endpoint /drag/onlDragDataSource/testConnection. Deserialization vulnerabilities occur when untrusted data is processed by an application to reconstruct objects, which can lead to remote code execution, privilege escalation, or denial of service if exploited. In this case, the vulnerability allows an attacker to remotely manipulate serialized data sent to the affected endpoint without requiring authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/AT:N/UI:N/PR:L). The attack complexity is low, and the vulnerability impacts confidentiality, integrity, and availability to a limited extent. The vendor has acknowledged the issue and indicated that a fix will be included in the next version, but no patch links are currently available. There are no known exploits in the wild at this time. The CVSS 4.0 score is 5.3, reflecting a medium severity level, with partial impact on the system's security properties and limited scope. The vulnerability is notable because deserialization flaws can be leveraged for remote code execution, which can severely compromise affected systems if exploited successfully.

For European organizations using jeecgboot JimuReport versions 2.1.0 or 2.1.1, this vulnerability poses a moderate risk. Exploitation could allow attackers to remotely execute arbitrary code or manipulate application behavior without authentication, potentially leading to data breaches, service disruption, or unauthorized access to sensitive reporting data. Organizations relying on JimuReport for critical business intelligence or operational dashboards may face integrity and availability issues, impacting decision-making processes. Given the medium severity and the lack of known exploits, the immediate risk is moderate but could escalate if exploit code becomes publicly available. The vulnerability's remote attack vector and low complexity mean that attackers with network access could attempt exploitation, increasing the threat surface. European entities in sectors such as finance, manufacturing, or public administration that use JimuReport for data visualization and reporting should be particularly vigilant, as compromise could lead to exposure of sensitive operational data or disruption of reporting services.

Organizations should prioritize upgrading to the fixed version of JimuReport once it is released by the vendor, as this is the definitive solution. Until then, practical mitigations include restricting network access to the vulnerable endpoint (/drag/onlDragDataSource/testConnection) through firewall rules or application-layer filtering to limit exposure to trusted IP addresses only. Implementing strict input validation and monitoring for anomalous requests targeting the deserialization functionality can help detect exploitation attempts. Employing web application firewalls (WAFs) with custom rules to block suspicious serialized payloads may reduce risk. Additionally, organizations should conduct thorough logging and alerting on access to the vulnerable endpoint to enable rapid incident response. Regular security assessments and penetration testing focused on deserialization vulnerabilities can help identify residual risks. Finally, educating development teams about secure deserialization practices and applying secure coding standards will help prevent similar issues in future releases.