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CVE-2026-58644— Microsoft SharePoint Remote Code Execution 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存在反序列化注入漏洞，该漏洞源于对不可信数据的反序列化，可能导致未经授权的攻击者通

CVSS 9.8 · Critical KEV EPSS 15.87% · P97

Public Exploits 1

Nuclei · 1 CVE-2026-58644.yaml [template]

Affected Version Matrix 3

VendorProduct Version RangeStatus
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0< 16.0.5556.1005 affected
Microsoft Microsoft SharePoint Server 2019 16.0.0< 16.0.10417.20153 affected
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0< 16.0.19725.20384 affected
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I. Basic Information for CVE-2026-58644

Vulnerability Information
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Vulnerability Title
Microsoft SharePoint Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code 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:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Office Sharepoint Server 反序列化注入漏洞
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存在反序列化注入漏洞，该漏洞源于对不可信数据的反序列化，可能导致未经授权的攻击者通
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 ~ 16.0.5556.1005 -
Microsoft Microsoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20153 -
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.19725.20384 -

II. Public POCs for CVE-2026-58644

# POC Description Source Link Shenlong Link
1 Microsoft SharePoint Server (2016, 2019, Subscription Edition <= 2026.3.1) contains a remote code execution vulnerability in the WS-Federation passive sign-in endpoint (/_trust/default.aspx). The SharePoint authentication module (SPFederationAuthenticationModuleV2) uses a deflate-only DeflateCookieTransform (no MAC/signature check) to decode and BinaryFormatter to deserialize the SecurityContextToken Cookie value in the wresult parameter without type restrictions. An unauthenticated attacker can send a crafted WS-Federation token containing a BinaryFormatter gadget chain (DataSet + LosFormatter + XamlAssemblyLoadFromFile) to execute arbitrary code in the context of the IIS application pool identity (w3wp.exe). The fix (KB5002882, July 2026 CU) replaces the DeflateCookieTransform with NotSupportedCookieTransform, making ReadToken() throw before deserialization. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-58644.yaml POC Details
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III. Intelligence Information for CVE-2026-58644

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Vendor Advisories for CVE-2026-58644 (1)

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

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CVE-2026-55008 9.6 CRITICAL Microsoft Exchange Server Spoofing 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
CVE-2026-50687 8.8 HIGH Windows Win32k Elevation of Privilege 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-502

V. Comments for CVE-2026-58644

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