CVE-2026-45459

Microsoft Excel Security Feature Bypass Vulnerability

State: Published
Severity: 3.3 Low
Published: Jun 9, 2026
Updated: Sep 24, 2026
Reserved: May 12, 2026

Description

Protection mechanism failure in Microsoft Office Excel allows an unauthorized attacker to bypass a security feature locally.

Scores

CVSS	Score	Vector	Source
3.1	3.3 Low	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-693 Protection Mechanism Failure

Affected Products

Product	Versions
Microsoft 365 Apps for EnterpriseMicrosoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office 365 for MacMicrosoft	1.0.0 to before 16.110.26061317Affected
Microsoft Office LTSC 2024Microsoft	16.0.0 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office LTSC for Mac 2021Microsoft	16.0.1 to before 16.110.26061317Affected
Microsoft Office LTSC for Mac 2024Microsoft	16.0.0 to before 16.110.26061317Affected

References

Microsoft Excel Security Feature Bypass Vulnerabilityvendor-advisorypatch

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