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CVE-2026-45659— Microsoft SharePoint Remote Code Execution Vulnerability

CVSS 8.8 · High EPSS 0.50% · P66

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 3

VendorProductVersion RangeStatus
MicrosoftMicrosoft SharePoint Enterprise Server 201616.0.0< 16.0.5552.1002affected
MicrosoftMicrosoft SharePoint Server 201916.0.0< 16.0.10417.20128affected
MicrosoftMicrosoft SharePoint Server Subscription Edition16.0.0< 16.0.19725.20280affected
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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: NVD (National Vulnerability Database)
Vulnerability Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
可信数据的反序列化
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
MicrosoftMicrosoft SharePoint Enterprise Server 2016 16.0.0 ~ 16.0.5552.1002 -
MicrosoftMicrosoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20128 -
MicrosoftMicrosoft 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

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CVE-2026-4041210.0 CRITICALAzure Orbital Spatio Remote Code Execution Vulnerability
CVE-2026-404119.9 CRITICALAzure Virtual Network Gateway Remote Code Execution Vulnerability
CVE-2026-410909.3 CRITICALMicrosoft Copilot Tampering Vulnerability
CVE-2026-338439.1 CRITICALMicrosoft Azure Active Directory B2C Elevation of Privilege Vulnerability
CVE-2026-354308.8 HIGHAzure Privileged Identity Management (PIM) Elevation of Privilege Vulnerability
CVE-2026-261477.7 HIGHAzure Stack HCI Information Disclosure Vulnerability
CVE-2026-236637.5 HIGHMicrosoft Global Secure Access (GSA) Information Disclosure Vulnerability
CVE-2026-428276.5 MEDIUMM365 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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