cve-2026-58277

The cve-2026-58277 tag covers Microsoft’s high-severity elevation-of-privilege vulnerability in on-premises SharePoint Server 2016 and SharePoint Server 2019. The flaw involves improper authorization and can allow an authorized attacker to elevate privileges over a network. Coverage focuses on Microsoft’s July 14, 2026 security updates, including KB5002891 for SharePoint Server 2016 and KB5002883 for SharePoint Server 2019. Administrators are advised to apply the patches promptly, complete the required SharePoint farm configuration steps, and verify the resulting build level. The vulnerability carries a Microsoft CVSS 3.1 score of 8.8, making timely remediation especially important for affected environments.