CVE-2025-29801 is a vulnerability identified in Microsoft AutoUpdate (MAU) for Mac, specifically version 4.0.0, where incorrect default permissions are set on certain components or files. This misconfiguration falls under CWE-276 (Incorrect Default Permissions) and allows an authorized attacker with local access and limited privileges to escalate their privileges on the affected system. The vulnerability does not require user interaction and can be exploited with low attack complexity, but the attacker must already have some level of local access (PR:L). The impact is significant, affecting confidentiality, integrity, and availability (C:H/I:H/A:H) of the system, as the attacker can gain elevated privileges and potentially control or manipulate system processes or data. The CVSS 3.1 score of 7.8 reflects these factors, with the vector indicating local attack vector, low complexity, privileges required, no user interaction, and unchanged scope. No public exploits or active exploitation have been reported yet, but the vulnerability is publicly disclosed and should be treated with urgency. The vulnerability is particularly relevant for environments where Mac devices are used extensively and where Microsoft AutoUpdate is deployed to manage software updates. Since MAU is a common update mechanism for Microsoft Office and other Microsoft software on Mac, this vulnerability could be leveraged to compromise enterprise Mac endpoints if left unpatched.

For European organizations, this vulnerability poses a significant risk to Mac endpoints, which are increasingly common in corporate environments, especially in sectors like finance, technology, and government. An attacker who gains local access—potentially through other means such as phishing or physical access—could escalate privileges and gain control over the system, leading to data breaches, unauthorized access to sensitive information, or disruption of services. This could impact confidentiality by exposing sensitive corporate or personal data, integrity by allowing unauthorized modifications, and availability by enabling denial of service or persistent malware installation. Organizations relying on Microsoft Office and related software on Mac devices are particularly vulnerable. The risk is heightened in environments with lax local user privilege management or where endpoint security monitoring is insufficient. The absence of known exploits in the wild provides a window for proactive mitigation, but the high severity score indicates that exploitation could have serious consequences.

1. Apply patches or updates from Microsoft as soon as they become available for Microsoft AutoUpdate for Mac. 2. Until patches are released, restrict local user permissions on Mac devices to the minimum necessary, avoiding granting unnecessary administrative rights. 3. Implement strict endpoint security controls, including application whitelisting and monitoring for unusual privilege escalation attempts. 4. Conduct regular audits of file and directory permissions related to Microsoft AutoUpdate components to detect and correct misconfigurations. 5. Educate users about the risks of local access compromise and enforce strong physical security policies to prevent unauthorized local access. 6. Use endpoint detection and response (EDR) tools capable of detecting suspicious local privilege escalation behaviors. 7. Review and harden macOS security configurations, including System Integrity Protection (SIP) and user account controls. 8. Maintain robust logging and alerting to quickly identify potential exploitation attempts. These steps go beyond generic advice by focusing on permission audits, endpoint monitoring, and user education specific to the nature of this vulnerability.