Summary
Impact: Elevation of Privilege. Microsoft rating: Moderate. Exploited according to Microsoft — Exploitation Detected. Customer action: Required.
Details
According to the CVSS metric, the attack vector is network (AV:N) and the attack complexity is low (AC:L). What does that mean for this vulnerability?
The attack vector is Network (AV:N) because this vulnerability is remotely exploitable and can be exploited from the internet. The attack complexity is Low (AC:L) because an attacker does not require significant prior knowledge of the system and can achieve repeatable success with the payload against the vulnerable component.
I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?
Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.
Security updates
16.0.5561.1001 — https://support.microsoft.com/help/5002891
16.0.10417.20175 — https://support.microsoft.com/help/5002883
16.0.19725.20434 — https://support.microsoft.com/help/5002882
Vulnerabilities 1
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Medium 5.3
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
KEV Jul 14, 2026
Revision history
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#1
Information published.
References
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CVE-2026-56164 Microsoft SharePoint Server Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss