CVE-2025-66374 is a vulnerability identified in CyberArk Endpoint Privilege Manager Agent versions through 25.10.0 that permits a local user to escalate privileges by leveraging the policy elevation mechanism for administrative tasks. The vulnerability arises because the agent improperly enforces privilege boundaries when applying policy-based elevation, allowing a non-privileged local user to gain administrative rights on the endpoint. This type of privilege escalation can be exploited by an attacker who already has local access, such as a low-privileged user or a malicious insider, to gain full control over the system. The lack of a CVSS score indicates that the vulnerability is newly published and not yet fully assessed. No known public exploits or patches are currently available, increasing the urgency for organizations to implement interim controls. CyberArk Endpoint Privilege Manager is widely deployed in enterprise environments to manage and restrict privileged access, making this vulnerability particularly critical as it undermines the core security function of the product. The vulnerability could be exploited to disable security controls, install persistent malware, or move laterally within a network. The technical details confirm the vulnerability was reserved in late 2025 and published in early 2026, indicating recent discovery. The absence of required user interaction and the local nature of the exploit simplify exploitation for insiders or attackers with limited access.

For European organizations, this vulnerability poses a significant risk to endpoint security and overall network integrity. Successful exploitation allows attackers to gain administrative privileges on affected endpoints, potentially leading to full system compromise, unauthorized access to sensitive data, and disruption of critical services. Organizations relying on CyberArk Endpoint Privilege Manager for enforcing least privilege policies may find their security posture severely weakened. This could facilitate lateral movement by attackers, increasing the risk of widespread breaches. Critical sectors such as finance, healthcare, government, and energy in Europe could be particularly impacted due to their reliance on privileged access management solutions. The vulnerability could also undermine compliance with European data protection regulations like GDPR if exploited to access or exfiltrate personal data. The lack of known public exploits reduces immediate risk but also means organizations must proactively address the vulnerability before attackers develop weaponized code.

Immediate mitigation steps include restricting local user permissions to the minimum necessary, especially on endpoints running CyberArk Endpoint Privilege Manager. Organizations should implement strict access controls and monitor logs for unusual privilege elevation attempts. Network segmentation can limit lateral movement if compromise occurs. Until an official patch is released, consider disabling or limiting the use of policy elevation features where feasible. Employ endpoint detection and response (EDR) tools to detect anomalous administrative activity. Conduct thorough audits of local user accounts and remove unnecessary privileges. Maintain up-to-date backups and incident response plans to quickly recover from potential compromises. Once CyberArk releases a patch, prioritize timely deployment across all affected systems. Engage with CyberArk support and threat intelligence sources for updates and indicators of compromise related to this vulnerability.