How to Mitigate CVE-2025-29976 - Microsoft SharePoint Server Elevation of Privilege Vulnerability

CVE-2025-29976 is a vulnerability in Microsoft SharePoint Server that allows an authorized attacker to elevate their privileges locally due to improper privilege management. To mitigate this vulnerability, follow the steps outlined below.

1. Apply Security Updates

The first and most effective step to mitigate this vulnerability is to apply the latest security updates provided by Microsoft. Regularly check for updates and ensure that your SharePoint Server is running the most recent version.

• Visit the Microsoft Security Response Center for the latest patches.

• Implement all recommended updates for your SharePoint environment.

2. Review User Permissions

Conduct a thorough review of user permissions within your SharePoint environment. Ensure that users have only the privileges necessary for their roles.

• Audit user roles and permissions regularly.

• Remove unnecessary administrative privileges.

3. Implement Least Privilege Principle

Adopt the principle of least privilege by ensuring that users are granted the minimum level of access required to perform their job functions.

• Limit the number of users with high-level privileges.

• Regularly reassess user roles to ensure compliance with the least privilege principle.

4. Monitor and Log Activities

Establish robust monitoring and logging practices to detect any unauthorized access attempts or privilege escalations.

• Enable logging features in SharePoint to track user activities.

• Review logs regularly for suspicious activities.

5. Educate Users

Provide training to users about the importance of security practices and the risks associated with privilege escalation.

• Conduct regular security awareness sessions.

• Encourage users to report suspicious activities immediately.

6. Regularly Assess Security Posture

Conduct regular security assessments and penetration testing to identify potential vulnerabilities in your SharePoint environment.

• Engage with external security experts if necessary.

• Implement findings from assessments to strengthen security measures.

Conclusion

By applying these mitigation strategies, organizations can significantly reduce the risk associated with CVE-2025-29976 and protect their SharePoint environments from potential privilege escalation attacks. Always stay informed about new vulnerabilities and best practices in security management.