Security Feature Bypass in Microsoft Office Excel
CVE-2026-45459

3.3LOW

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 365 For Mac
Microsoft Office Ltsc 2024
Microsoft Office Ltsc For Mac 2021
Vendor
CVE Published:
9 June 2026

What is CVE-2026-45459?

A significant vulnerability in Microsoft Office Excel allows an unauthorized attacker to bypass essential security features intended to protect users. This failure in protection mechanisms could enable local exploitation, thereby exposing sensitive data and functionalities within the application. Organizations and users are urged to apply relevant security updates promptly to mitigate the risks associated with this vulnerability.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 365 for Mac 1.0.0 < 16.110.26061317

Microsoft Office LTSC 2024 32-bit Systems 16.0.0

References

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

CVSS V3.1

Score:
3.3
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.