CVE-2026-47642: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
CVE-2026-47642 is a use-after-free vulnerability in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. This flaw allows an unauthorized attacker to execute code locally on the affected system. The vulnerability has a high severity rating with a CVSS score of 7.8. An official fix is available from Microsoft, and the vendor manages remediation for this cloud-hosted service. No known exploits are reported in the wild at this time.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-47642) involves a use-after-free condition in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise. Exploitation could allow an unauthorized attacker to execute arbitrary code locally. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. Microsoft has released an official fix and manages remediation for this cloud service. The affected version explicitly identified is 16.0.1. No public exploits are currently known.
Potential Impact
Successful exploitation of this use-after-free vulnerability could lead to local code execution by an unauthorized attacker, potentially compromising confidentiality, integrity, and availability of the affected system. The high CVSS score indicates significant impact if exploited.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise installations are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47642 to mitigate this vulnerability.
CVE-2026-47642: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
Description
CVE-2026-47642 is a use-after-free vulnerability in Microsoft Office Excel within Microsoft 365 Apps for Enterprise. This flaw allows an unauthorized attacker to execute code locally on the affected system. The vulnerability has a high severity rating with a CVSS score of 7.8. An official fix is available from Microsoft, and the vendor manages remediation for this cloud-hosted service. No known exploits are reported in the wild at this time.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-47642) involves a use-after-free condition in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise. Exploitation could allow an unauthorized attacker to execute arbitrary code locally. The CVSS v3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. Microsoft has released an official fix and manages remediation for this cloud service. The affected version explicitly identified is 16.0.1. No public exploits are currently known.
Potential Impact
Successful exploitation of this use-after-free vulnerability could lead to local code execution by an unauthorized attacker, potentially compromising confidentiality, integrity, and availability of the affected system. The high CVSS score indicates significant impact if exploited.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise installations are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47642 to mitigate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-05-19T20:12:27.070Z
- 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-2026-47642","vendor":"Microsoft"}]
Threat ID: 6a56768c68715ace43f08bc1
Added to database: 07/14/2026, 17:49:00 UTC
Last enriched: 07/15/2026, 00:48:53 UTC
Last updated: 07/15/2026, 00:48:53 UTC
Views: 5
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