CVE-2025-66374 is a vulnerability in the CyberArk Endpoint Privilege Manager Agent, a widely used privileged access management (PAM) solution designed to control and monitor administrative privileges on endpoints. The flaw exists in versions up to and including 25.10.0 and allows a local user to escalate privileges by manipulating the policy elevation mechanism associated with administrative tasks. Specifically, the vulnerability arises because the agent improperly enforces policy elevation controls, enabling a user with limited privileges to elevate their rights to administrative levels without proper authorization. The vulnerability is classified under CWE-269 (Improper Privilege Management), indicating a failure to correctly restrict privilege escalation paths. The CVSS v3.1 base score is 7.8, reflecting high severity with a vector of AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, meaning the attack requires local access and low complexity, with some privileges but no user interaction, and impacts confidentiality, integrity, and availability severely. Although no public exploits are currently known, the potential for abuse is significant given the critical role of CyberArk in securing privileged accounts. The vulnerability could allow attackers to bypass endpoint privilege restrictions, gain administrative control, install persistent malware, or move laterally within networks.

The impact of CVE-2025-66374 is substantial for organizations using CyberArk Endpoint Privilege Manager. Successful exploitation allows local users to gain administrative privileges, effectively bypassing endpoint security controls designed to limit privilege escalation. This can lead to full system compromise, including unauthorized access to sensitive data, modification or deletion of critical files, and disruption of system availability. Attackers could leverage this to deploy malware, establish persistence, or pivot to other network assets, increasing the risk of widespread breaches. Enterprises relying on CyberArk for privileged access management may find their security posture significantly weakened, undermining compliance with regulatory requirements and increasing exposure to insider threats or compromised accounts. The lack of known exploits currently provides a window for mitigation, but the vulnerability's high severity demands urgent attention.

Organizations should immediately audit and restrict local user privileges on endpoints running CyberArk Endpoint Privilege Manager Agent to the minimum necessary. Implement strict access controls to prevent untrusted users from executing administrative tasks or modifying policy settings. Monitor logs and alerts for unusual privilege elevation attempts or policy changes within the CyberArk agent. Employ application whitelisting and endpoint detection and response (EDR) tools to detect anomalous behavior indicative of exploitation attempts. Until an official patch is released, consider isolating critical systems or limiting local user access. Engage with CyberArk support for any available workarounds or interim mitigations. Regularly update and test backup and recovery procedures to mitigate potential damage from exploitation. Once patches become available, prioritize their deployment in all affected environments. Additionally, conduct user training to raise awareness about the risks of local privilege escalation and enforce the principle of least privilege across all endpoints.