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CVE-2026-45659— 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是美国微软（Microsoft）公司的一个企业内容协作与文档管理平台。 Microsoft Office SharePoint存在代码问题漏洞，该漏洞源于反序列化不受信任的数据，可能导致授权攻击者通过网络执行代码。

CVSS 8.8 · High KEV · Ransomware EPSS 2.70% · P85

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 3

VendorProduct Version RangeStatus
Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0< 16.0.5552.1002 affected
Microsoft Microsoft SharePoint Server 2019 16.0.0< 16.0.10417.20128 affected
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0< 16.0.19725.20280 affected
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I. Basic Information for CVE-2026-45659

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 authorized attacker to execute code over a network.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Office SharePoint是美国微软（Microsoft）公司的一个企业内容协作与文档管理平台。 Microsoft Office SharePoint存在代码问题漏洞，该漏洞源于反序列化不受信任的数据，可能导致授权攻击者通过网络执行代码。
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 ~ 16.0.5552.1002 -
Microsoft Microsoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20128 -
Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.19725.20280 -

II. Public POCs for CVE-2026-45659

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III. Intelligence Information for CVE-2026-45659

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Vendor Advisories for CVE-2026-45659 (1)

Same Patch Batch · Microsoft · 2026-05-22 · 13 CVEs total

CVE-2026-42901 10.0 CRITICAL Microsoft Entra ID Elevation of Privilege Vulnerability
CVE-2026-41104 10.0 CRITICAL Microsoft Planetary Computer Pro Information Disclosure Vulnerability
CVE-2026-47280 10.0 CRITICAL Azure Resource Manager Elevation of Privilege Vulnerability
CVE-2026-23652 10.0 CRITICAL Microsoft Power Pages Remote Code Execution Vulnerability
CVE-2026-40412 10.0 CRITICAL Azure Orbital Spatio Remote Code Execution Vulnerability
CVE-2026-40411 9.9 CRITICAL Azure Virtual Network Gateway Remote Code Execution Vulnerability
CVE-2026-41090 9.3 CRITICAL Microsoft Copilot Tampering Vulnerability
CVE-2026-33843 9.1 CRITICAL Microsoft Azure Active Directory B2C Elevation of Privilege Vulnerability
CVE-2026-35430 8.8 HIGH Azure Privileged Identity Management (PIM) Elevation of Privilege Vulnerability
CVE-2026-26147 7.7 HIGH Azure Stack HCI Information Disclosure Vulnerability
CVE-2026-23663 7.5 HIGH Microsoft Global Secure Access (GSA) Information Disclosure Vulnerability
CVE-2026-42827 6.5 MEDIUM M365 Copilot Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft SharePoint Enterprise Server 2016
Same vendor: Microsoft
Same weakness: CWE-502

V. Comments for CVE-2026-45659

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