CVE-2026-62870: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
CVE-2026-62870 is a use-after-free vulnerability in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. This vulnerability allows an unauthorized attacker to execute code remotely over a network. The issue affects version 16.0.1 of the product. An official fix is available from Microsoft. The vulnerability has a high severity with a CVSS score of 8.8.
AI Analysis
Technical Summary
CVE-2026-62870 is a use-after-free vulnerability (CWE-416) in Microsoft Office Excel component of Microsoft 365 Apps for Enterprise, specifically affecting version 16.0.1. The flaw allows remote code execution by an unauthorized attacker over a network. Microsoft has published an official fix for this vulnerability and manages remediation for this cloud-hosted service. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code remotely on the affected system, potentially leading to full compromise of confidentiality, integrity, and availability of the affected Microsoft 365 Apps for Enterprise environment.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise environment is updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62870.
CVE-2026-62870: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
Description
CVE-2026-62870 is a use-after-free vulnerability in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. This vulnerability allows an unauthorized attacker to execute code remotely over a network. The issue affects version 16.0.1 of the product. An official fix is available from Microsoft. The vulnerability has a high severity with a CVSS score of 8.8.
CVSS v3.1
Score 8.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-62870 is a use-after-free vulnerability (CWE-416) in Microsoft Office Excel component of Microsoft 365 Apps for Enterprise, specifically affecting version 16.0.1. The flaw allows remote code execution by an unauthorized attacker over a network. Microsoft has published an official fix for this vulnerability and manages remediation for this cloud-hosted service. The CVSS v3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, no privileges required, user interaction required, and high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code remotely on the affected system, potentially leading to full compromise of confidentiality, integrity, and availability of the affected Microsoft 365 Apps for Enterprise environment.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud service, Microsoft manages remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise environment is updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62870.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-14T21:13:55.099Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Is Cloud Service
- true
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62870","vendor":"Microsoft"}]
Threat ID: 6a7121fcbf32cb7a3462c04c
Added to database: 08/03/2026, 23:19:24 UTC
Last enriched: 08/03/2026, 23:33:25 UTC
Last updated: 08/04/2026, 02:10:12 UTC
Views: 5
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