Critical CVE-2026-58644 Affects Microsoft SharePoint Enterprise Server 2016

## Overview Microsoft disclosed a critical vulnerability, CVE-2026-58644, affecting SharePoint Enterprise Server 2016. This flaw involves the deserialization of untrusted data, which can lead to remote code execution. The CVSS score for this vulnerability is 9.8, indicating a high severity level. ## Technical Details CVE-2026-58644 allows an unauthorized attacker to exploit the deserialization process within Microsoft SharePoint. Attackers can send specially crafted requests to the server, which may lead to arbitrary code execution. This vulnerability arises from improper validation of user-supplied data during the deserialization process. The issue affects the server's ability to handle untrusted data securely. ## Impact Successful exploitation of this vulnerability can allow attackers to execute arbitrary code on the affected system. This could lead to unauthorized access, data breaches, or further compromise of the network. Organizations using SharePoint Enterprise Server 2016 should be particularly vigilant, as the impact can be severe, affecting data integrity and confidentiality. ## Mitigation Defenders should prioritize applying the latest security patches released by Microsoft for SharePoint Enterprise Server 2016. Regularly update systems and review security configurations to minimize exposure. Additionally, implement network segmentation and monitor for unusual activity that may indicate exploitation attempts.