CISA Adds CVE-2026-56164 to KEV List for SharePoint Server

## Overview CISA added CVE-2026-56164 to its Known Exploited Vulnerabilities (KEV) catalog on July 14, 2026. This vulnerability affects Microsoft SharePoint Server. It allows unauthorized attackers to elevate privileges over a network due to missing authentication for critical functions. The addition to the KEV list indicates an increased risk of exploitation, prompting organizations to take immediate action. ## Technical Details CVE-2026-56164 is classified with a CVSS score of 5.3, indicating moderate severity. The vulnerability arises from a failure in the authentication mechanism within SharePoint Server. Attackers can exploit this flaw to gain elevated privileges without proper authorization. This could lead to unauthorized access to sensitive data and functions within the SharePoint environment. ## Impact The potential impact of CVE-2026-56164 is significant. An attacker exploiting this vulnerability could manipulate SharePoint resources, access confidential information, and perform actions that could compromise the integrity of the entire SharePoint server. Organizations relying on SharePoint for collaboration and document management face heightened risks if they do not address this vulnerability promptly. ## Mitigation Defenders should prioritize patching affected SharePoint Server installations. Microsoft has released updates to address this vulnerability. Organizations are advised to review their SharePoint configurations and ensure that security best practices are followed. Regular audits and monitoring for unusual activity can help mitigate the risks associated with this vulnerability.