CVE-2025-47151 is a critical security vulnerability classified under CWE-843 (Access of Resource Using Incompatible Type, or type confusion) found in Entr'ouvert Lasso versions 2.5.1 and 2.8.2. The flaw exists in the lasso_node_impl_init_from_xml function, which processes XML data within SAML responses. An attacker can exploit this vulnerability by crafting a malicious SAML response that causes the function to misinterpret data types, leading to memory corruption and enabling arbitrary code execution. This vulnerability can be triggered remotely over the network without any authentication or user interaction, making it highly exploitable. The CVSS v3.1 base score is 9.8, reflecting its critical severity with high impact on confidentiality, integrity, and availability. Entr'ouvert Lasso is a library used for SAML authentication and federation, which is integral to many identity and access management systems. The lack of known exploits in the wild suggests this is a newly disclosed vulnerability, but the potential for rapid exploitation is high given the nature of the flaw and its remote attack vector. The vulnerability affects organizations relying on Entr'ouvert Lasso for SAML processing, potentially allowing attackers to gain unauthorized access, execute arbitrary code on affected systems, and disrupt services.

For European organizations, the impact of CVE-2025-47151 is substantial. Many enterprises and government agencies in Europe utilize SAML-based single sign-on (SSO) solutions that may incorporate Entr'ouvert Lasso for identity federation. Exploitation could lead to full system compromise, data breaches involving sensitive personal and corporate information, and disruption of critical services. The arbitrary code execution capability means attackers could deploy malware, ransomware, or establish persistent backdoors. This poses a direct threat to compliance with stringent European data protection regulations such as GDPR, potentially resulting in legal and financial penalties. The vulnerability's remote and unauthenticated exploitation vector increases the risk of widespread attacks, especially targeting sectors with high-value data like finance, healthcare, and public administration. Additionally, the disruption of authentication services could impact business continuity and trust in digital identity frameworks.

Given the absence of published patches at the time of disclosure, European organizations should implement immediate compensating controls. These include deploying network-level filtering to restrict and monitor inbound SAML traffic, especially from untrusted sources. Implement strict validation and sanitization of all SAML responses before processing, possibly using additional XML schema validation tools. Employ runtime application self-protection (RASP) or web application firewalls (WAFs) configured to detect anomalous XML payloads or unusual SAML assertions. Conduct thorough audits of systems using Entr'ouvert Lasso to identify affected versions and isolate them where possible. Prepare for rapid patch deployment once vendor updates become available. Additionally, enhance logging and monitoring to detect exploitation attempts and unusual authentication activities. Educate security teams on this vulnerability to ensure swift incident response if exploitation is suspected.