CVE-2025-29976: Privilege Escalation in Microsoft SharePoint

Successful exploitation of CVE-2025-29976 allows an authenticated attacker to bypass security controls and gain elevated privileges within the SharePoint environment. This could enable them to access and modify sensitive data, install malicious software, or even compromise the underlying server. The impact is particularly severe in environments where SharePoint is used to manage critical business processes or store confidential information. An attacker could leverage this privilege escalation to move laterally within the network, potentially impacting other systems and data stores. The blast radius extends to any resource accessible by the SharePoint server.

1. Reserved2025-03-12
2. Published2025-05-13
3. Modified2026-02-13
4. EPSS updated2026-03-23

The primary mitigation for CVE-2025-29976 is to upgrade to Microsoft SharePoint Enterprise Server version 16.0.18526.20286 or later. If immediate patching is not feasible, consider implementing stricter access controls within SharePoint to limit the potential impact of a successful attack. Review and enforce the principle of least privilege for all SharePoint users and applications. Monitor SharePoint logs for suspicious activity, particularly privilege escalation attempts. While a direct workaround is unavailable, ensuring robust network segmentation can limit lateral movement if exploitation occurs. After upgrade, confirm successful remediation by attempting to reproduce the vulnerability with a test account and verifying that privilege escalation is prevented.