CVE-2025-56590 is a critical vulnerability identified in the InsertFromURL() function of the Apryse HTML2PDF SDK versions up to 11.10. This function is designed to convert HTML content from a URL into PDF format. The vulnerability arises due to improper sanitization or validation of input parameters passed to InsertFromURL(), which leads to command injection (CWE-78). An attacker can craft malicious input that causes the underlying system to execute arbitrary operating system commands on the server hosting the SDK. The vulnerability is remotely exploitable over the network without requiring any authentication or user interaction, making it highly accessible to attackers. The CVSS v3.1 base score is 9.8, reflecting the ease of exploitation (attack vector network), lack of required privileges, and the severe impact on confidentiality, integrity, and availability of the affected system. Successful exploitation could lead to full system compromise, data theft, service disruption, or use of the server as a pivot point for further attacks. No patches or fixes are currently linked, and no known exploits are publicly reported, but the critical nature demands immediate attention. The vulnerability affects any application or service integrating the vulnerable Apryse HTML2PDF SDK, especially those exposed to untrusted inputs or internet-facing environments.

For European organizations, this vulnerability poses a significant risk, especially for those relying on Apryse HTML2PDF SDK in their document processing, web applications, or backend services. Exploitation could lead to complete server compromise, unauthorized data access, or disruption of critical services. This can impact confidentiality by exposing sensitive documents or internal data, integrity by allowing attackers to alter or inject malicious content, and availability by causing denial of service or system crashes. Organizations in sectors such as finance, healthcare, government, and legal services, which often handle sensitive documents and use PDF generation tools, are particularly vulnerable. The ease of exploitation without authentication increases the likelihood of attacks, potentially leading to data breaches, regulatory fines under GDPR, reputational damage, and operational downtime.

Given the absence of an official patch, European organizations should immediately implement the following mitigations: 1) Restrict network access to systems running the Apryse HTML2PDF SDK, limiting exposure to trusted internal networks only. 2) Employ strict input validation and sanitization on any user-supplied URLs or data passed to InsertFromURL() to prevent injection of malicious commands. 3) Use application-layer firewalls or web application firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the InsertFromURL() function. 4) Monitor logs and network traffic for unusual command execution attempts or anomalies related to PDF generation services. 5) Consider isolating the PDF generation service in a sandboxed or containerized environment with minimal privileges to limit impact if exploited. 6) Engage with Apryse for updates and patches and plan for immediate deployment once available. 7) Conduct security assessments and penetration testing focused on this vulnerability vector to identify exposure.