---
id: "CVE-2026-110052"
page: "https://infrastack.ai/live/CVE-2026-110052"
kind: "vulnerability"
aliases: ["CVE-2026-110052"]
title: "Microsoft Word: use-after-free lets an attacker run code when a victim opens a crafted file"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Office LTSC 2021", "fixed": ["16.0.14334.21048"], "affected": "< 16.0.14334.21048", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2024", "fixed": ["16.0.17932.21140"], "affected": "< 16.0.17932.21140", "ecosystem": "vendor"}, {"name": "Microsoft Office for Mac (365, LTSC 2021, LTSC 2024)", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}, {"name": "Microsoft 365 Apps for Enterprise", "fixed": [], "affected": ">= 16.0.1, below the Nov 2026 build at aka.ms/OfficeSecurityReleases", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["macos", "microsoft-office", "other", "user-interaction", "windows", "word"]
not_affected_if: []
published_at: "2026-11-10T19:18:22+00:00"
first_seen_at: "2026-11-10T19:24:27+00:00"
updated_at: "2026-11-11T00:35:35+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-110052", "first_seen_at": "2026-11-10T19:24:27+00:00"}, {"source": "analyst", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-110052", "first_seen_at": "2026-11-11T00:35:35+00:00", "cites": ["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-110052", "https://app.opencve.io/cve/CVE-2026-110052"]}]
exploit_sources: []
---

# Microsoft Word: use-after-free lets an attacker run code when a victim opens a crafted file

Link for people: https://infrastack.ai/live/CVE-2026-110052 (this .md is for agents)

Use-after-free (CWE-416) in Microsoft Office Word allows code execution. Microsoft's CVSS vector is AV:N/AC:H/PR:N/UI:R, so the victim has to open or interact with crafted content. No exploitation or public PoC reported as of 2026-11-10; not in CISA KEV. Fixed in the November 2026 updates.

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

## Affected

- vendor:Microsoft Office LTSC 2021 affected < 16.0.14334.21048 fixed 16.0.14334.21048
- vendor:Microsoft Office LTSC 2024 affected < 16.0.17932.21140 fixed 16.0.17932.21140
- vendor:Microsoft Office for Mac (365, LTSC 2021, LTSC 2024) affected < 16.115.26110837 fixed 16.115.26110837
- vendor:Microsoft 365 Apps for Enterprise affected >= 16.0.1, below the Nov 2026 build at aka.ms/OfficeSecurityReleases fixed no fixed version listed

## How to check

Windows: in Word go to File > Account > About Word and compare the build. Office LTSC 2021 needs 16.0.14334.21048 or later, Office LTSC 2024 needs 16.0.17932.21140 or later. Microsoft 365 Apps: compare against the builds at https://aka.ms/OfficeSecurityReleases (the Nov 2026 release). Mac: Word > About Word, version must be 16.115.26110837 or later.

## Fix

Install the November 2026 Office updates: Office LTSC 2021 16.0.14334.21048, Office LTSC 2024 16.0.17932.21140, Office for Mac (365, LTSC 2021, LTSC 2024) 16.115.26110837. Microsoft 365 Apps: update to the current build on https://aka.ms/OfficeSecurityReleases.

## Timeline

- 2026-11-10T19:24:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-110052
- 2026-11-11T00:35:35+00:00 analyst https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-110052 — MSRC page is JS-only and did not render; versions come from Microsoft's CNA record (via OpenCVE/NVD), so nothing marked verified. CVSS 7.5 requires user interaction (UI:R, AC:H); no exploitation or PoC reported, not in KEV. Fixed in Nov 2026 Patch Tuesday.

## Documents

- [advisory] MSRC Security Update Guide: CVE-2026-110052 (page did not render) https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-110052
- [describes] OpenCVE: CVE-2026-110052 (copy of Microsoft CNA record) https://app.opencve.io/cve/CVE-2026-110052

## From the sources

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

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