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CVE-2026-62870— Microsoft Excel Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Microsoft 365 Apps for Enterprise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft 365 Apps for Enterprise是美国Microsoft公司的一款办公软件套件。 Microsoft 365 Apps for Enterprise、Microsoft Excel 2016、Microsoft Office 2019、Microsoft Office LTSC 2021和Microsoft Office LTSC 2024存在资源管理错误漏洞，该漏洞源于Microsoft Office Excel存在释放后重用问题，可能导致未经授权的攻击者通过网络执行代

CVSS 8.8 · High EPSS 0.63% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
Microsoft Microsoft 365 Apps for Enterprise 16.0.1< https://aka.ms/OfficeSecurityReleases affected
Microsoft Microsoft Excel 2016 16.0.0.0< 16.0.5561.1001 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
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I. Basic Information for CVE-2026-62870

Vulnerability Information
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Vulnerability Title
Microsoft Excel Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Use after free in Microsoft Office Excel 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:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft 365 Apps for Enterprise 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft 365 Apps for Enterprise是美国Microsoft公司的一款办公软件套件。 Microsoft 365 Apps for Enterprise、Microsoft Excel 2016、Microsoft Office 2019、Microsoft Office LTSC 2021和Microsoft Office LTSC 2024存在资源管理错误漏洞，该漏洞源于Microsoft Office Excel存在释放后重用问题，可能导致未经授权的攻击者通过网络执行代
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 Excel 2016 16.0.0.0 ~ 16.0.5561.1001 -
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 -

II. Public POCs for CVE-2026-62870

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III. Intelligence Information for CVE-2026-62870

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Vendor Advisories for CVE-2026-62870 (1)

Same Patch Batch · Microsoft · 2026-08-03 · 16 CVEs total

CVE-2026-66318 8.1 HIGH Microsoft Edge (Chromium-based) Information Disclosure Vulnerability
CVE-2026-66310 7.7 HIGH Microsoft Edge for Android Information Disclosure Vulnerability
CVE-2026-66315 7.5 HIGH Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2026-65802 7.4 HIGH Microsoft Edge for Android Information Disclosure Vulnerability
CVE-2026-66321 7.4 HIGH Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2026-66322 7.1 HIGH Microsoft Edge (Chromium-based) Spoofing Vulnerability
CVE-2026-66313 6.8 MEDIUM Microsoft Edge (Chromium-based) Tampering Vulnerability
CVE-2026-66326 6.5 MEDIUM Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2026-66314 6.5 MEDIUM Microsoft Edge (Chromium-based) Information Disclosure Vulnerability
CVE-2026-66312 6.5 MEDIUM Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability
CVE-2026-66311 6.2 MEDIUM Microsoft Edge (Chromium-based) Tampering Vulnerability
CVE-2026-66325 6.1 MEDIUM Microsoft Edge (Chromium-based) Spoofing Vulnerability
CVE-2026-65804 6.1 MEDIUM Microsoft Edge (Chromium-based) Spoofing Vulnerability
CVE-2026-66317 5.4 MEDIUM Microsoft Edge (Chromium-based) Tampering Vulnerability
CVE-2026-66316 5.4 MEDIUM Microsoft Edge (Chromium-based) Spoofing Vulnerability

IV. Related Vulnerabilities

Same product: Microsoft 365 Apps for Enterprise
Same vendor: Microsoft
Same weakness: CWE-416

V. Comments for CVE-2026-62870

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