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CVE-2026-64898: Microsoft Office Allows Unapproved Code Execution

CVE-2026-64898 · published 2 months ago

Summary

Microsoft Office has a weakness that could let hackers run unauthorized code on a computer. This is a concern because it could be exploited to steal sensitive information or cause other malicious activities. To protect your organization, update Microsoft Office to the latest version and ensure you're running a reputable antivirus program.

What to do

Update microsoft microsoft 365 apps for enterprise to version https://aka.ms/OfficeSecurityReleases or later.
Update microsoft microsoft office 2019 to version https://aka.ms/OfficeSecurityReleases or later.
Update microsoft microsoft office 365 for mac to version 16.112.26081010 or later.
Update microsoft microsoft office ltsc 2021 to version https://aka.ms/OfficeSecurityReleases or later.
Update microsoft microsoft office ltsc 2024 to version https://aka.ms/OfficeSecurityReleases or later.
Update microsoft microsoft office ltsc for mac 2021 to version 16.112.26081010 or later.
Update microsoft microsoft office ltsc for mac 2024 to version 16.112.26081010 or later.

Affected software

Vendor	Product	Affected versions
microsoft	microsoft 365 apps for enterprise	< https://aka.ms/OfficeSecurityReleases 16.0.1
microsoft	microsoft office 2019	< https://aka.ms/OfficeSecurityReleases 19.0.0
microsoft	microsoft office 365 for mac	< 16.112.26081010
microsoft	microsoft office ltsc 2021	< https://aka.ms/OfficeSecurityReleases 16.0.1
microsoft	microsoft office ltsc 2024	< https://aka.ms/OfficeSecurityReleases 16.0.0
microsoft	microsoft office ltsc for mac 2021	< 16.112.26081010
microsoft	microsoft office ltsc for mac 2024	< 16.112.26081010
microsoft	365_apps	All versions `cpe:2.3:a:microsoft:365_apps:-::::enterprise::x64:*`
microsoft	microsoft_365	All versions `cpe:2.3:a:microsoft:microsoft_365:-:::::macos::`
microsoft	office_2019	All versions `cpe:2.3:a:microsoft:office_2019:-::::::x64:`
microsoft	office_2021	All versions `cpe:2.3:a:microsoft:office_2021:-::::ltsc:-:x64:`
microsoft	office_2024	All versions `cpe:2.3:a:microsoft:office_2024:-::::ltsc:-:x64:`

Original advisory text

Microsoft Office Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64898 vendor-advisory patch

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

7.8 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-122Heap-based Buffer Overflow

CWE-190Integer Overflow

Timeline

Published11 Aug 2026

Updated4 Nov 2026

First seen11 Aug 2026

Sources

CVE-2026-64898 · NVD

CVE-2026-64898 · MITRE

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