CVE-2026-23657: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-23657) involves a use-after-free condition in Microsoft Office Word, part of Microsoft 365 Apps for Enterprise. Exploitation could allow an unauthorized attacker to execute arbitrary code locally. The issue is tracked under CWE-416. Microsoft has published an official fix and manages remediation for this cloud service. The CVSS 3.1 base score is 7.8, indicating high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can lead to local code execution by an unauthorized attacker, compromising confidentiality, integrity, and availability of the affected system. This could allow the attacker to run arbitrary code with the privileges of the user running Microsoft Word.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users and administrators should ensure that Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23657 to apply the fix.
CVE-2026-23657: CWE-416: Use After Free in Microsoft Microsoft 365 Apps for Enterprise
Description
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-23657) involves a use-after-free condition in Microsoft Office Word, part of Microsoft 365 Apps for Enterprise. Exploitation could allow an unauthorized attacker to execute arbitrary code locally. The issue is tracked under CWE-416. Microsoft has published an official fix and manages remediation for this cloud service. The CVSS 3.1 base score is 7.8, indicating high impact on confidentiality, integrity, and availability.
Potential Impact
Successful exploitation can lead to local code execution by an unauthorized attacker, compromising confidentiality, integrity, and availability of the affected system. This could allow the attacker to run arbitrary code with the privileges of the user running Microsoft Word.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Users and administrators should ensure that Microsoft 365 Apps for Enterprise are updated according to the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23657 to apply the fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-01-14T16:59:33.463Z
- 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-2026-23657","vendor":"Microsoft"}]
Threat ID: 69de7a1482d89c981fd6a5ef
Added to database: 04/14/2026, 17:32:04 UTC
Last enriched: 06/19/2026, 16:57:13 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 102
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