---
id: "CVE-2026-109487"
page: "https://infrastack.ai/live/CVE-2026-109487"
kind: "vulnerability"
aliases: ["CVE-2026-109487"]
title: "Microsoft PowerPoint: use-after-free lets a network attacker run code"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "Microsoft 365 Apps for Enterprise", "fixed": ["2610 build 20527.20196"], "affected": ">= 16.0.1, < build in aka.ms/OfficeSecurityReleases (Nov 10 2026)", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2021", "fixed": ["16.0.14334.21048"], "affected": ">= 16.0.1, < 16.0.14334.21048", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2024", "fixed": ["16.0.17932.21140"], "affected": ">= 16.0.0, < 16.0.17932.21140", "ecosystem": "vendor"}, {"name": "Microsoft Office for Mac", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}]
ecosystems: []
tags: ["macos", "microsoft-office", "package", "powerpoint", "windows"]
not_affected_if: ["no-powerpoint", "patched-nov-2026"]
published_at: "2026-11-10T19:18:17+00:00"
first_seen_at: "2026-11-10T19:24:25+00:00"
updated_at: "2026-11-11T00:44:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-109487", "first_seen_at": "2026-11-10T19:24:25+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/cve-2026-109487", "first_seen_at": "2026-11-11T00:44:17+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/cve-2026-109487", "https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"]}]
exploit_sources: []
---

# Microsoft PowerPoint: use-after-free lets a network attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-109487 (this .md is for agents)

A memory-handling bug in Microsoft Office PowerPoint lets an unauthorized attacker run code on a victim's machine over a network. The sources give no further detail on how the file or message is delivered.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft 365 Apps for Enterprise affected >= 16.0.1, < build in aka.ms/OfficeSecurityReleases (Nov 10 2026) fixed 2610 build 20527.20196
- vendor:Microsoft Office LTSC 2021 affected >= 16.0.1, < 16.0.14334.21048 fixed 16.0.14334.21048
- vendor:Microsoft Office LTSC 2024 affected >= 16.0.0, < 16.0.17932.21140 fixed 16.0.17932.21140
- vendor:Microsoft Office for Mac affected < 16.115.26110837 fixed 16.115.26110837

## How to check

In any Office app open File > Account and compare the version/build to the fixed builds (Windows: LTSC 2024 16.0.17932.21140, LTSC 2021 16.0.14334.21048, 365 Apps see aka.ms/OfficeSecurityReleases; Mac: 16.115.26110837). Anything older is affected.

## Fix

Update to the Nov 10 2026 Office builds: Microsoft 365 Apps/Office 2024/2021 Retail Current Channel 2610 (build 20527.20196); Office LTSC 2024 16.0.17932.21140; Office LTSC 2021 16.0.14334.21048; Office for Mac (365, LTSC 2021, LTSC 2024) 16.115.26110837.

## Timeline

- 2026-11-10T19:24:25+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-109487
- 2026-11-11T00:44:17+00:00 analyst https://nvd.nist.gov/vuln/detail/cve-2026-109487 — Read Microsoft's CNA record (via NVD) and the Microsoft Learn Office security release notes (Nov 10 2026). MSRC page itself did not load. Fix builds from CNA data; user interaction required per Microsoft's vector (UI:R, AC:H). Preview Pane claim is from a third party only, not included. No exploitation or PoC reported.

## Documents

- [advisory] NVD CVE-2026-109487 (Microsoft CNA record) https://nvd.nist.gov/vuln/detail/cve-2026-109487
- [fix] Microsoft Office security updates release notes (Nov 10, 2026) https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates

## From the sources

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

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_