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CVE-2026-88144: PowerPoint in Microsoft 365 may run malicious code

CVE-2026-88144 · published 22 days ago

Summary

Certain versions of PowerPoint in Microsoft 365, Office 365 for Mac, and the 2021/2024 LTSC releases have a flaw that could let an attacker execute code from a distance. This could allow unwanted programs to run on users' computers without permission. Apply the latest security updates from Microsoft as soon as they are available to protect your systems.

What to do

Update microsoft microsoft office ltsc 2021 to version 16.0.14334.20974 or later.
Update microsoft microsoft office ltsc 2024 to version 16.0.17932.21056 or later.

Affected software

Vendor	Product	Affected versions
microsoft	microsoft 365 apps for enterprise	16.0.1
microsoft	microsoft office 365 for mac	< publication < 16.114.26101123
microsoft	microsoft office ltsc 2021	< 16.0.14334.20974
microsoft	microsoft office ltsc 2024	< 16.0.17932.21056
microsoft	microsoft office ltsc for mac 2021	< publication < 16.114.26101123
microsoft	microsoft office ltsc for mac 2024	< publication < 16.114.26101123
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_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 PowerPoint Remote Code Execution Vulnerability

Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88144 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-416Use After Free

Timeline

Published13 Oct 2026

Updated31 Oct 2026

First seen13 Oct 2026

Sources

CVE-2026-88144 · NVD

CVE-2026-88144 · MITRE

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