CVE-2025-59228: 
vulnerability analysis and mitigation

A remote code execution vulnerability (CVE-2025-59228) was discovered in Microsoft Office SharePoint, affecting SharePoint Server 2016, 2019, and Subscription Edition. The vulnerability was disclosed on October 14, 2025, and involves improper input validation that allows an authorized attacker to execute code over a network (NVD, Microsoft Advisory).

The vulnerability has been assigned a CVSS v3.1 Base Score of 8.8 (HIGH) with the following vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The vulnerability is classified under CWE-20 (Improper Input Validation) and requires low attack complexity while having a network attack vector (NVD).

If successfully exploited, this vulnerability allows an attacker with low privileges to achieve remote code execution with high impacts on confidentiality, integrity, and availability of the affected SharePoint systems (NVD).

Microsoft has released security updates (KB5002786 for Subscription Edition, KB5002796 for SharePoint 2019, and KB5002788 for SharePoint 2016) to address this vulnerability. Users are advised to install these updates through Microsoft Update, Microsoft Update Catalog, or Microsoft Download Center (SharePoint Updates).