CVE-2025-47151 is a critical security vulnerability classified as CWE-843 (Access of Resource Using Incompatible Type, or type confusion) found in the Entr'ouvert Lasso product, specifically versions 2.5.1 and 2.8.2. The flaw exists in the function lasso_node_impl_init_from_xml, which is responsible for initializing XML nodes from SAML responses. Due to improper type handling, an attacker can craft a malicious SAML response that triggers type confusion, allowing them to manipulate memory in unintended ways. This manipulation can lead to arbitrary code execution within the context of the application processing the SAML response. The vulnerability is exploitable remotely over the network without requiring prior authentication, but it does require the victim system to process the malicious SAML response, implying some level of user or system interaction with the SAML authentication flow. The CVSS v3.1 base score is 9.6, reflecting the critical nature of the vulnerability with high impact on confidentiality, integrity, and availability, and low attack complexity. Although no known exploits have been reported in the wild as of the publication date, the potential for exploitation is significant given the widespread use of SAML in federated identity management and Entr'ouvert Lasso's role as a SAML toolkit. The vulnerability could allow attackers to bypass authentication, execute arbitrary commands, or disrupt services, posing a severe risk to affected environments.

For European organizations, the impact of CVE-2025-47151 is substantial, especially for those relying on Entr'ouvert Lasso for SAML-based single sign-on (SSO) or identity federation services. Successful exploitation could lead to unauthorized access to sensitive systems, data breaches involving personal or corporate information, and potential lateral movement within networks. The arbitrary code execution capability means attackers could deploy malware, ransomware, or establish persistent backdoors, severely compromising operational continuity and data integrity. Critical sectors such as government, finance, healthcare, and telecommunications that depend on federated identity solutions are particularly vulnerable. Additionally, disruption of authentication services could lead to denial of access for legitimate users, impacting business operations and service delivery. Given the interconnected nature of European IT infrastructures and strict data protection regulations like GDPR, the consequences of exploitation include regulatory penalties and reputational damage.

To mitigate CVE-2025-47151, European organizations should immediately identify and inventory all Entr'ouvert Lasso deployments, focusing on versions 2.5.1 and 2.8.2. Although no official patches are currently listed, organizations should monitor vendor advisories for updates and apply patches promptly upon release. In the interim, implement strict validation of all incoming SAML responses, including schema validation and signature verification to prevent malformed or unauthorized messages. Deploy Web Application Firewalls (WAFs) with custom rules to detect and block suspicious SAML payloads or anomalous XML structures indicative of exploitation attempts. Limit exposure by restricting network access to SAML endpoints to trusted sources only. Conduct thorough logging and monitoring of authentication traffic to identify unusual patterns or failed attempts. Additionally, consider isolating or sandboxing the Lasso processing environment to contain potential exploitation impacts. Regularly update and test incident response plans to handle potential breaches stemming from this vulnerability.