Out-of-Bounds Read Vulnerability in Microsoft Excel
CVE-2026-40360

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Excel 2016
Microsoft Office 2019
Microsoft Office Ltsc 2021
Vendor
CVE Published:
12 May 2026

What is CVE-2026-40360?

An out-of-bounds read vulnerability in Microsoft Excel may permit unauthorized attackers to disclose sensitive information locally. This weakness poses a significant risk as it can lead to the unauthorized exposure of confidential data, necessitating swift action for mitigation. Users are advised to apply security updates provided by Microsoft to safeguard their systems and prevent exploitation.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Excel 2016 32-bit Systems 16.0.0.0 < 16.0.5552.1000

Microsoft Office 2019 32-bit Systems 19.0.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.