CVE-2026-40362: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40362) involves a heap-based buffer overflow in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise version 16.0.1. An attacker can exploit this flaw to execute arbitrary code locally without privileges, requiring user interaction. The CVSS v3.1 score is 7.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix and manages remediation for this cloud-hosted service. No active exploitation has been reported.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary code locally on the affected system, potentially leading to full compromise of the affected Microsoft 365 Apps for Enterprise environment. The vulnerability impacts confidentiality, integrity, and availability. However, exploitation requires local access and user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Administrators and users should ensure that their Microsoft 365 Apps for Enterprise installations are updated to the latest patched version as per Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40362.
CVE-2026-40362: CWE-122: Heap-based Buffer Overflow in Microsoft Microsoft 365 Apps for Enterprise
Description
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40362) involves a heap-based buffer overflow in Microsoft Office Excel, part of Microsoft 365 Apps for Enterprise version 16.0.1. An attacker can exploit this flaw to execute arbitrary code locally without privileges, requiring user interaction. The CVSS v3.1 score is 7.8, indicating high impact on confidentiality, integrity, and availability. Microsoft has published an official fix and manages remediation for this cloud-hosted service. No active exploitation has been reported.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary code locally on the affected system, potentially leading to full compromise of the affected Microsoft 365 Apps for Enterprise environment. The vulnerability impacts confidentiality, integrity, and availability. However, exploitation requires local access and user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since this is a cloud-hosted service, Microsoft manages remediation server-side. Administrators and users should ensure that their Microsoft 365 Apps for Enterprise installations are updated to the latest patched version as per Microsoft's advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40362.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-11T23:06:15.614Z
- 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-2026-40362","vendor":"Microsoft"}]
Threat ID: 6a036550cbff5d861008c8e9
Added to database: 5/12/2026, 5:37:20 PM
Last enriched: 5/12/2026, 6:53:41 PM
Last updated: 5/13/2026, 4:47:50 AM
Views: 2
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