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CVE-2026-55020— Microsoft SharePoint Server Spoofing Vulnerability

CVSS 4.6 · Medium EPSS 0.34% · P26

Affected Version Matrix 3

VendorProductVersion RangeStatus
MicrosoftMicrosoft SharePoint Enterprise Server 201616.0.0< 16.0.5561.1001affected
MicrosoftMicrosoft SharePoint Server 201916.0.0< 16.0.10417.20175affected
MicrosoftMicrosoft SharePoint Server Subscription Edition16.0.0< 16.0.19725.20434affected
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I. Basic Information for CVE-2026-55020

Vulnerability Information
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Vulnerability Title
Microsoft SharePoint Server Spoofing 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 perform spoofing 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:L/I:L/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，该漏洞可能导致授权攻击者通过网络进行欺骗。
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

VendorProductAffected VersionsCPESubscribe
MicrosoftMicrosoft SharePoint Enterprise Server 2016 16.0.0 ~ 16.0.5561.1001 -
MicrosoftMicrosoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20175 -
MicrosoftMicrosoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.19725.20434 -

II. Public POCs for CVE-2026-55020

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III. Intelligence Information for CVE-2026-55020

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Vendor Advisories for CVE-2026-55020 (1)

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

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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-79

V. Comments for CVE-2026-55020

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