CVE-2025-37735 is a vulnerability classified under CWE-281 (Improper Preservation of Permissions) affecting Elastic Kibana's Elastic Defend module on Windows platforms. Elastic Defend runs as a SYSTEM-level service, which inherently has full control over the host system. Due to improper handling of file permissions, this service can be tricked into deleting arbitrary files on the system. An attacker with low privileges on the host can exploit this flaw to remove critical files, potentially disrupting system operations or escalating their privileges locally. The vulnerability affects Kibana versions 8.0.0 and 9.0.0, both of which include Elastic Defend for endpoint security. Exploitation requires local access and has a high attack complexity, meaning it is not trivial to exploit but feasible under certain conditions. The vulnerability impacts confidentiality, integrity, and availability because arbitrary file deletion can lead to data loss, system instability, or privilege escalation. No user interaction is required, and the scope is limited to the local host. No public exploits have been reported yet, but the severity rating and the SYSTEM-level service context make this a critical issue for organizations relying on Elastic Stack for security monitoring and endpoint defense on Windows systems.

The vulnerability allows attackers with low-level local access to delete arbitrary files via the Elastic Defend service running as SYSTEM, which can lead to significant impacts. Organizations may face local privilege escalation, enabling attackers to gain higher system privileges and potentially full control over affected hosts. This can compromise system confidentiality by exposing sensitive files, integrity by modifying or deleting critical files, and availability by disrupting system or security service operations. The deletion of files by a SYSTEM-level service can also undermine the reliability of security monitoring and incident response capabilities provided by Elastic Defend. For enterprises relying on Elastic Stack for security and operational monitoring, this vulnerability could lead to blind spots in detection and response, increasing the risk of further compromise. The requirement for local access limits remote exploitation but does not eliminate risk in environments where attackers can gain initial footholds or where insider threats exist.

To mitigate CVE-2025-37735, organizations should immediately upgrade Elastic Kibana to patched versions once available from Elastic. In the absence of patches, restrict local access to Windows hosts running Elastic Defend to trusted administrators only. Implement strict file system permissions and monitoring to detect unauthorized file deletions, especially targeting critical system and Elastic Defend-related files. Employ application whitelisting and endpoint protection to prevent unauthorized execution of code that could trigger the vulnerability. Regularly audit and harden the configuration of Elastic Defend and related services to minimize attack surface. Consider isolating Elastic Defend services in hardened environments or containers where feasible. Maintain comprehensive logging and alerting to quickly identify suspicious activities related to file deletions or privilege escalations. Finally, educate system administrators about the risks and signs of exploitation to improve detection and response capabilities.