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CVE-2026-56164— Microsoft SharePoint Server Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Microsoft SharePoint Enterprise Server 2016
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Office Sharepoint Server是美国Microsoft公司的一款为企业客户而设计的、基于web的内容管理和协作工具。该软件初始版本以Office组件形式存在,现在也仍然大大依托于Office,以提供企业门户、文档协同等功能为主,之后版本支持将Office、Exchange、Lync、Project和Visio结合起来。 Microsoft Office Sharepoint Server存在授权问题漏洞，该漏洞源于缺少关键功能身份验证，可能允许未经授权的攻击者通过网络

CVSS 5.3 · Medium KEV EPSS 22.44% · P98

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 3

VendorProduct Version RangeStatus
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0< 16.0.5561.1001 affected
Microsoft Microsoft SharePoint Server 2019 16.0.0< 16.0.10417.20175 affected
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0< 16.0.19725.20434 affected
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I. Basic Information for CVE-2026-56164

Vulnerability Information
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Vulnerability Title
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Office Sharepoint Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office Sharepoint Server是美国Microsoft公司的一款为企业客户而设计的、基于web的内容管理和协作工具。该软件初始版本以Office组件形式存在,现在也仍然大大依托于Office,以提供企业门户、文档协同等功能为主,之后版本支持将Office、Exchange、Lync、Project和Visio结合起来。 Microsoft Office Sharepoint Server存在授权问题漏洞，该漏洞源于缺少关键功能身份验证，可能允许未经授权的攻击者通过网络
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0 ~ 16.0.5561.1001 -
Microsoft Microsoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20175 -
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.19725.20434 -

II. Public POCs for CVE-2026-56164

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III. Intelligence Information for CVE-2026-56164

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Vendor Advisories for CVE-2026-56164 (1)

Same Patch Batch · Microsoft · 2026-07-14 · 570 CVEs total

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CVE-2026-50522 9.8 CRITICAL Microsoft SharePoint Remote Code Execution Vulnerability
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CVE-2026-50518 9.8 CRITICAL Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-56188 9.8 CRITICAL Windows Server Network driver Remote Code Execution Vulnerability
CVE-2026-55010 9.8 CRITICAL Minecraft Bedrock Dedicated Server Remote Code Execution Vulnerability
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CVE-2026-49172 9.8 CRITICAL Windows FTP Service Remote Code Execution Vulnerability
CVE-2026-55944 9.8 CRITICAL Microsoft Dynamics NAV and Microsoft Dynamics 365 Business Central (On Premises) Remote Co
CVE-2026-56159 9.8 CRITICAL DHCP Server Service Remote Code Execution Vulnerability
CVE-2026-48561 9.6 CRITICAL Microsoft Edge Copilot Remote Code Execution Vulnerability
CVE-2026-55008 9.6 CRITICAL Microsoft Exchange Server Spoofing Vulnerability
CVE-2026-50380 9.6 CRITICAL Windows GDI+ Remote Code Execution Vulnerability
CVE-2026-49798 9.3 CRITICAL Windows Kernel Elevation of Privilege Vulnerability
CVE-2026-55040 9.1 CRITICAL Microsoft SharePoint Server Security Feature Bypass Vulnerability

Showing top 20 of 570 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft SharePoint Enterprise Server 2016
Same vendor: Microsoft
Same weakness: CWE-306

V. Comments for CVE-2026-56164

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