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CVE-2026-21511— Microsoft Outlook Spoofing Vulnerability

CVSS 7.5 · High EPSS 0.24% · P47
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I. Basic Information for CVE-2026-21511

Vulnerability Information
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Vulnerability Title
Microsoft Outlook Spoofing Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing over a network.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
可信数据的反序列化
Source: NVD (National Vulnerability Database)
Vulnerability Title
Microsoft Outlook 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Outlook是美国微软（Microsoft）公司的一套电子邮件应用程序。 Microsoft Outlook存在代码问题漏洞。攻击者利用该漏洞执行欺骗攻击。以下产品和版本受到影响：Microsoft Office LTSC 2021 for 64-bit editions,Microsoft Office LTSC 2021 for 32-bit editions,Microsoft SharePoint Server Subscription Edition,Microsoft O
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 365 Apps for Enterprise 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office 2019 19.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC 2021 16.0.1 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC 2024 16.0.0 ~ https://aka.ms/OfficeSecurityReleases -
MicrosoftMicrosoft Office LTSC for Mac 2021 16.0.1 ~ 16.106.26020821 -
MicrosoftMicrosoft Office LTSC for Mac 2024 16.0.0 ~ 16.106.26020821 -
MicrosoftMicrosoft SharePoint Enterprise Server 2016 16.0.0 ~ 16.0.5539.1002 -
MicrosoftMicrosoft SharePoint Server 2019 16.0.0 ~ 16.0.10417.20097 -
MicrosoftMicrosoft SharePoint Server Subscription Edition 16.0.0 ~ 16.0.19127.20518 -
MicrosoftMicrosoft Word 2016 16.0.1 ~ 16.0.5539.1002 -

II. Public POCs for CVE-2026-21511

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III. Intelligence Information for CVE-2026-21511

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Same Patch Batch · Microsoft · 2026-02-10 · 54 CVEs total

CVE-2026-215319.8 CRITICALAzure SDK for Python Remote Code Execution Vulnerability
CVE-2026-215108.8 HIGHWindows Shell Security Feature Bypass Vulnerability
CVE-2026-215378.8 HIGHMicrosoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
CVE-2026-215138.8 HIGHMSHTML Framework Security Feature Bypass Vulnerability
CVE-2026-215188.8 HIGHGitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability
CVE-2026-212558.8 HIGHWindows Hyper-V Security Feature Bypass Vulnerability
CVE-2026-212568.8 HIGHGitHub Copilot and Visual Studio Remote Code Execution Vulnerability
CVE-2026-215168.8 HIGHGitHub Copilot for Jetbrains Remote Code Execution Vulnerability
CVE-2026-212288.1 HIGHAzure Local Remote Code Execution Vulnerability
CVE-2026-212298.0 HIGHPower BI Remote Code Execution Vulnerability
CVE-2026-212578.0 HIGHGitHub Copilot and Visual Studio Elevation of Privilege Vulnerability
CVE-2026-215238.0 HIGHGitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
CVE-2026-212507.8 HIGHWindows HTTP.sys Elevation of Privilege Vulnerability
CVE-2026-215337.8 HIGHWindows Remote Desktop Services Elevation of Privilege Vulnerability
CVE-2026-215147.8 HIGHMicrosoft Word Security Feature Bypass Vulnerability
CVE-2026-212517.8 HIGHCluster Client Failover (CCF) Elevation of Privilege Vulnerability
CVE-2026-212387.8 HIGHWindows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-212317.8 HIGHWindows Kernel Elevation of Privilege Vulnerability
CVE-2026-212327.8 HIGHWindows HTTP.sys Elevation of Privilege Vulnerability
CVE-2026-212397.8 HIGHWindows Kernel Elevation of Privilege Vulnerability

Showing top 20 of 54 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Microsoft 365 Apps for Enterprise
Same vendor: Microsoft
Same weakness: CWE-502

V. Comments for CVE-2026-21511

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