CVE-2026-40360: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
AI Analysis
Technical Summary
CVE-2026-40360 is a CWE-125 out-of-bounds read vulnerability affecting Microsoft Office Excel in Microsoft 365 Apps for Enterprise version 16.0.1. This vulnerability enables an unauthorized attacker to perform a local information disclosure by reading memory outside the intended bounds. The vulnerability has been assigned a CVSS v3.1 base score of 7.8, indicating high severity. Microsoft has released an official fix for this issue and manages remediation for this cloud-hosted service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation of this vulnerability could lead to unauthorized local disclosure of sensitive information due to out-of-bounds memory reads in Microsoft Excel. The impact includes confidentiality, integrity, and availability impacts rated high according to the CVSS vector. However, exploitation requires local access and user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft 365 Apps for Enterprise is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise installations are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40360.
CVE-2026-40360: CWE-125: Out-of-bounds Read in Microsoft Microsoft 365 Apps for Enterprise
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-40360 is a CWE-125 out-of-bounds read vulnerability affecting Microsoft Office Excel in Microsoft 365 Apps for Enterprise version 16.0.1. This vulnerability enables an unauthorized attacker to perform a local information disclosure by reading memory outside the intended bounds. The vulnerability has been assigned a CVSS v3.1 base score of 7.8, indicating high severity. Microsoft has released an official fix for this issue and manages remediation for this cloud-hosted service. No known exploits are reported in the wild at this time.
Potential Impact
Successful exploitation of this vulnerability could lead to unauthorized local disclosure of sensitive information due to out-of-bounds memory reads in Microsoft Excel. The impact includes confidentiality, integrity, and availability impacts rated high according to the CVSS vector. However, exploitation requires local access and user interaction.
Mitigation Recommendations
An official fix is available from Microsoft. Since Microsoft 365 Apps for Enterprise is a cloud service, Microsoft manages the remediation server-side. Users and administrators should ensure their Microsoft 365 Apps for Enterprise installations are updated according to Microsoft's guidance at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40360.
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-2026-40360","vendor":"Microsoft"}]
Threat ID: 6a03654ccbff5d861008c821
Added to database: 05/12/2026, 17:37:16 UTC
Last enriched: 06/19/2026, 17:36:14 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 59
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