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CVE-2026-70355— Microsoft SharePoint Server Elevation of Privilege Vulnerability

Quick assessment

Affected
Microsoft Microsoft SharePoint Server 2019
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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存在跨站脚本漏洞，该漏洞源于网页生成过程中输入中和不当（跨站脚本），可能导致授权攻

CVSS 7.3 · High EPSS 0.78% · P54

Affected Version Matrix 2

VendorProduct Version RangeStatus
Microsoft Microsoft SharePoint Server 2019 16.0.0< 16.0.10417.20198 affected
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0< 16.0.19725.20522 affected
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I. Basic Information for CVE-2026-70355

Vulnerability Information
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Vulnerability Title
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Office Sharepoint Server 跨站脚本漏洞
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存在跨站脚本漏洞，该漏洞源于网页生成过程中输入中和不当（跨站脚本），可能导致授权攻
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 Server 2019 16.0.0 ~ 16.0.10417.20198 -
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.19725.20522 -

II. Public POCs for CVE-2026-70355

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III. Intelligence Information for CVE-2026-70355

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Vendor Advisories for CVE-2026-70355 (1)

Same Patch Batch · Microsoft · 2026-08-11 · 402 CVEs total

CVE-2026-62815 9.8 CRITICAL Microsoft QUIC Remote Code Execution Vulnerability
CVE-2026-62878 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-62893 9.8 CRITICAL Windows Deployment Services TFTP Server Remote Code Execution Vulnerability
CVE-2026-65791 9.8 CRITICAL Windows iSCSI Target Service Remote Code Execution Vulnerability
CVE-2026-59124 9.8 CRITICAL Microsoft High Performance Computing (HPC) Pack Remote Code Execution Vulnerability
CVE-2026-50516 9.4 CRITICAL Microsoft Azure Kubernetes Service Elevation of Privilege Vulnerability
CVE-2026-70306 9.3 CRITICAL Microsoft Office SharePoint Spoofing Vulnerability
CVE-2026-70321 8.8 HIGH Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2026-65658 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2026-62817 8.8 HIGH Windows DNS Server Remote Code Execution Vulnerability
CVE-2026-62816 8.8 HIGH Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability
CVE-2026-69320 8.8 HIGH Visual Studio Code Remote Code Execution Vulnerability
CVE-2026-62872 8.8 HIGH .NET Framework Elevation of Privilege Vulnerability
CVE-2026-62913 8.8 HIGH Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2026-62824 8.8 HIGH Remote Desktop Client Remote Code Execution Vulnerability
CVE-2026-62822 8.8 HIGH Windows GDI+ Remote Code Execution Vulnerability
CVE-2026-62823 8.8 HIGH Windows DHCP Server Remote Code Execution Vulnerability
CVE-2026-57104 8.8 HIGH Azure Storage Explorer Elevation of Privilege Vulnerability
CVE-2026-65811 8.8 HIGH Power BI Remote Code Execution Vulnerability
CVE-2026-70324 8.8 HIGH Microsoft SharePoint Elevation of Privilege Vulnerability

Showing top 20 of 402 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Microsoft SharePoint Server 2019
Same vendor: Microsoft
Same weakness: CWE-79

V. Comments for CVE-2026-70355

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