Type Confusion Vulnerability in Microsoft Office Products
CVE-2026-45458

8.4HIGH

Key Information:

Vendor: Microsoft
Status: Microsoft 365 Apps For Enterprise; Microsoft Office 2019; Microsoft Office 365 For Mac; Microsoft Office Ltsc 2021
Vendor: CVE Published:; 9 June 2026

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What is CVE-2026-45458?

false

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

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Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office 365 for Mac 1.0.0 < 16.110.26061317

References

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

vendor-advisorypatch

CVSS V3.1

Score:

8.4

Severity:

HIGH

Confidentiality:

High

Integrity:

High

Availability:

High

Attack Vector:

Local

Attack Complexity:

Low

Privileges Required:

None

User Interaction:

None

Scope:

Unchanged

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Timeline

Vulnerability published
Jun 9, 2026
Vulnerability Reserved
May 12, 2026

CVE-2026-45458 Data

JSON

Microsoft

What is CVE-2026-45458?

Human OS v1.0: Ageing Is an Unpatched Zero-Day Vulnerability.

Affected Version(s)

References

CVSS V3.1

Timeline

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.