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CVE-2026-69556: Microsoft Word lets remote attacker run code

CVE-2026-69556 · published 1 month ago

Summary

Microsoft Word can be tricked into running malicious programs from across the network. An attacker could take control of the computer that opens a specially crafted document. Apply the latest Microsoft security updates to protect your systems.

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 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 word 2016 to version 16.0.5569.1002 or later.
Update microsoft microsoft office 365 for mac to version 16.113.26091433 or later.
Update microsoft microsoft office ltsc for mac 2021 to version 16.113.26091433 or later.
Update microsoft microsoft office ltsc for mac 2024 to version 16.113.26091433 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	- < 16.113.26091433
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	- < 16.113.26091433
microsoft	microsoft office ltsc for mac 2024	- < 16.113.26091433
microsoft	microsoft word 2016	< 16.0.5569.1002
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:`
microsoft	word	2016 `cpe:2.3:a:microsoft:word:2016::::::x64:`

Original advisory text

Microsoft Office Word Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69556 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

8.8 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-122Heap-based Buffer Overflow

Timeline

Published8 Sep 2026

Updated4 Nov 2026

First seen8 Sep 2026

Sources

CVE-2026-69556 · NVD

CVE-2026-69556 · MITRE

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