CVE-2025-64087 is a critical Server-Side Template Injection (SSTI) vulnerability affecting the FreeMarker templating engine component within opensagres XDocReport versions 1.0.0 through 2.1.0. FreeMarker is a widely used Java-based template engine that processes template files to generate text output, commonly used in document generation systems. The vulnerability arises because the application accepts and processes untrusted template expressions without adequate sanitization or validation, allowing an attacker to inject malicious template code. This injected code executes on the server side during template rendering, enabling arbitrary code execution with the privileges of the application process. The vulnerability does not require authentication, making it accessible to remote attackers who can supply crafted template inputs, for example, through web interfaces or APIs that accept template data. Although no public exploits have been reported yet, the nature of SSTI vulnerabilities is such that they can lead to full system compromise, including data theft, service disruption, or lateral movement within the network. The affected software, opensagres XDocReport, is used for generating reports and documents in enterprise environments, often integrated into Java applications. The lack of a CVSS score indicates this is a newly published vulnerability, but the technical details and attack vector clearly indicate a high-risk scenario. The absence of official patches at the time of publication necessitates immediate risk mitigation through configuration changes, input validation, or temporary disabling of vulnerable features. Organizations should monitor for updates from the vendor and apply patches promptly once available.

For European organizations, the impact of CVE-2025-64087 can be severe. Exploitation allows attackers to execute arbitrary code on servers running vulnerable versions of opensagres XDocReport, potentially leading to full compromise of affected systems. This can result in unauthorized access to sensitive data, disruption of document generation services, and use of compromised servers as footholds for further attacks within corporate networks. Industries such as finance, healthcare, government, and manufacturing that rely on automated document processing are particularly at risk. The vulnerability could be leveraged to exfiltrate confidential information, manipulate reports, or deploy ransomware. Given the critical nature of document workflows in compliance and operational processes, disruption or data integrity loss could have regulatory and reputational consequences. Additionally, the ease of exploitation without authentication increases the likelihood of targeted attacks or opportunistic scanning by threat actors. European organizations with complex IT environments and legacy software deployments may face challenges in quickly identifying and remediating vulnerable instances, increasing exposure time.

To mitigate CVE-2025-64087, European organizations should take the following specific actions: 1) Immediately inventory all instances of opensagres XDocReport and identify versions between 1.0.0 and 2.1.0 in use. 2) Monitor vendor communications and apply official patches or updates as soon as they become available. 3) If patches are not yet available, disable or restrict access to any interfaces that accept user-supplied templates or template expressions. 4) Implement strict input validation and sanitization on all inputs that influence template rendering to prevent injection of malicious expressions. 5) Employ sandboxing or runtime restrictions on the FreeMarker engine to limit the execution capabilities of templates, such as disabling unsafe methods or restricting class access. 6) Enhance logging and monitoring to detect unusual template processing activities or errors indicative of exploitation attempts. 7) Conduct penetration testing and code reviews focused on template injection risks within affected applications. 8) Educate developers and administrators about secure template handling practices to prevent similar vulnerabilities. 9) Consider network segmentation and least privilege principles to limit the impact of potential compromises. These targeted measures go beyond generic advice by focusing on the specific attack vector and software component involved.