cve-2026-55020

CVE-2026-55020 is a confirmed Microsoft SharePoint Server spoofing vulnerability affecting SharePoint Server 2016, SharePoint Server 2019, and SharePoint Server Subscription Edition. This tag covers the July 14, 2026 security updates that address the flaw, along with the administrator actions needed to apply them safely. Updating affected SharePoint farms is not simply a routine Windows Update task: administrators should complete the SharePoint configuration upgrade and verify Microsoft Workflow Manager prerequisites. Use this page to follow guidance about the vulnerability, the relevant July security fixes, and the deployment considerations for organizations maintaining affected SharePoint environments.