CVE-2026-21511— Microsoft Outlook Spoofing Vulnerability
Quick assessment
Affected
Microsoft Microsoft 365 Apps for Enterprise
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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
Possible ATT&CK Techniques 3 AI
T1189 · Drive-by Compromise T1561 · Disk Wipe T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1< https://aka.ms/OfficeSecurityReleases |
affected |
| Microsoft | Microsoft Office 2019 | 19.0.0< https://aka.ms/OfficeSecurityReleases |
affected |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1< https://aka.ms/OfficeSecurityReleases |
affected |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0< https://aka.ms/OfficeSecurityReleases |
affected |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1< 16.106.26020821 |
affected |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0< 16.106.26020821 |
affected |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0< 16.0.5539.1002 |
affected |
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0< 16.0.10417.20097 |
affected |
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0< 16.0.19127.20518 |
affected |
| Microsoft | Microsoft Word 2016 | 16.0.1< 16.0.5539.1002 |
affected |
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I. Basic Information for CVE-2026-21511
Vulnerability Information
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Vulnerability Title
Microsoft Outlook Spoofing Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Deserialization of untrusted data in Microsoft Office Outlook allows an unauthorized attacker to perform spoofing 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:N/A:N
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 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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 ~ https://aka.ms/OfficeSecurityReleases | - |
|
| Microsoft | Microsoft Office 2019 | 19.0.0 ~ https://aka.ms/OfficeSecurityReleases | - |
|
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 ~ https://aka.ms/OfficeSecurityReleases | - |
|
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 ~ https://aka.ms/OfficeSecurityReleases | - |
|
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 ~ 16.106.26020821 | - |
|
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 ~ 16.106.26020821 | - |
|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | 16.0.0 ~ 16.0.5539.1002 | - |
|
| Microsoft | Microsoft SharePoint Server 2019 | 16.0.0 ~ 16.0.10417.20097 | - |
|
| Microsoft | Microsoft SharePoint Server Subscription Edition | 16.0.0 ~ 16.0.19127.20518 | - |
|
| Microsoft | Microsoft Word 2016 | 16.0.1 ~ 16.0.5539.1002 | - |
|
II. Public POCs for CVE-2026-21511
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Same Patch Batch · Microsoft · 2026-02-10 · 54 CVEs total
| CVE-2026-21531 | 9.8 CRITICAL | Azure SDK for Python Remote Code Execution Vulnerability |
| CVE-2026-21510 | 8.8 HIGH | Windows Shell Security Feature Bypass Vulnerability |
| CVE-2026-21537 | 8.8 HIGH | Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability |
| CVE-2026-21513 | 8.8 HIGH | MSHTML Framework Security Feature Bypass Vulnerability |
| CVE-2026-21518 | 8.8 HIGH | GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability |
| CVE-2026-21255 | 8.8 HIGH | Windows Hyper-V Security Feature Bypass Vulnerability |
| CVE-2026-21256 | 8.8 HIGH | GitHub Copilot and Visual Studio Remote Code Execution Vulnerability |
| CVE-2026-21516 | 8.8 HIGH | GitHub Copilot for Jetbrains Remote Code Execution Vulnerability |
| CVE-2026-21228 | 8.1 HIGH | Azure Local Remote Code Execution Vulnerability |
| CVE-2026-21229 | 8.0 HIGH | Power BI Remote Code Execution Vulnerability |
| CVE-2026-21257 | 8.0 HIGH | GitHub Copilot and Visual Studio Elevation of Privilege Vulnerability |
| CVE-2026-21523 | 8.0 HIGH | GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability |
| CVE-2026-21250 | 7.8 HIGH | Windows HTTP.sys Elevation of Privilege Vulnerability |
| CVE-2026-21533 | 7.8 HIGH | Windows Remote Desktop Services Elevation of Privilege Vulnerability |
| CVE-2026-21514 | 7.8 HIGH | Microsoft Word Security Feature Bypass Vulnerability |
| CVE-2026-21251 | 7.8 HIGH | Cluster Client Failover (CCF) Elevation of Privilege Vulnerability |
| CVE-2026-21238 | 7.8 HIGH | Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability |
| CVE-2026-21231 | 7.8 HIGH | Windows Kernel Elevation of Privilege Vulnerability |
| CVE-2026-21232 | 7.8 HIGH | Windows HTTP.sys Elevation of Privilege Vulnerability |
| CVE-2026-21239 | 7.8 HIGH | Windows Kernel Elevation of Privilege Vulnerability |
Showing top 20 of 54 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-21511
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