CVE-2026-45458

HighCVSS 8.4/10Last modified Jul 23, 2026

Description

Use after free in Microsoft Office allows an unauthorized attacker to execute code locally.

Metrics

CVSS 3.1 8.4/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

Vendor	Product	Versions
Microsoft	Microsoft 365 Apps for Enterprise	>= 16.0.1, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office 2019	>= 19.0.0, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office 365 for Mac	>= 1.0.0, < 16.110.26061317
Microsoft	Microsoft Office LTSC 2021	>= 16.0.1, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC 2024	>= 16.0.0, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office LTSC for Mac 2021	>= 16.0.1, < 16.110.26061317
Microsoft	Microsoft Office LTSC for Mac 2024	>= 16.0.0, < 16.110.26061317
Microsoft	Microsoft SharePoint Enterprise Server 2016	>= 16.0.0, < 16.0.5556.1005
Microsoft	Microsoft SharePoint Server 2019	>= 16.0.0, < 16.0.10417.20153
Microsoft	Microsoft SharePoint Server Subscription Edition	>= 16.0.0, < 16.0.19725.20384
Microsoft	Microsoft Word 2016	>= 16.0.1, < 16.0.5556.1000

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45458Vendor Advisory

Timeline

Published: Jun 9, 2026
Last modified: Jul 23, 2026
NVD status: Modified

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