Out-of-Bounds Read Vulnerability in Microsoft Office Excel
CVE-2026-55046

5.5MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Excel 2016
Microsoft Office 2019
Microsoft Office 365 For Mac
Vendor
CVE Published:
14 July 2026

What is CVE-2026-55046?

An out-of-bounds read vulnerability exists in Microsoft Office Excel, which could allow an attacker to disclose sensitive information from affected systems. This flaw may be exploited, enabling unauthorized access to data through the manipulation of specially crafted files. Users of Excel versions 2016, 2019, and Microsoft 365 are advised to apply security updates to mitigate potential risks. For more information and patch details, visit the Microsoft advisory.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Excel 2016 32-bit Systems 16.0.0.0 < 16.0.5561.1001

Microsoft Office 2019 32-bit Systems 19.0.0

References

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

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.