---
id: "CVE-2026-116722"
page: "https://infrastack.ai/live/CVE-2026-116722"
kind: "vulnerability"
aliases: ["CVE-2026-116722"]
title: "Microsoft Word: opening a crafted file can run attacker code (heap buffer overflow)"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft 365 Apps for Enterprise", "fixed": [], "affected": ">= 16.0.1, fixed build per channel at aka.ms/OfficeSecurityReleases", "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 365 for Mac", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC for Mac 2021", "fixed": ["16.115.26110837"], "affected": ">= 16.0.1, < 16.115.26110837", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC for Mac 2024", "fixed": ["16.115.26110837"], "affected": ">= 16.0.0, < 16.115.26110837", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["macos", "microsoft-office", "other", "user-interaction", "windows", "word"]
not_affected_if: ["auto-updated-to-fixed-build"]
published_at: "2026-11-10T19:19:18+00:00"
first_seen_at: "2026-11-10T19:24:45+00:00"
updated_at: "2026-11-10T23:37:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116722", "first_seen_at": "2026-11-10T19:24:45+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-116722", "first_seen_at": "2026-11-10T23:37:41+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-116722"]}]
exploit_sources: []
---

# Microsoft Word: opening a crafted file can run attacker code (heap buffer overflow)

Link for people: https://infrastack.ai/live/CVE-2026-116722 (this .md is for agents)

Heap-based buffer overflow in Microsoft Office Word lets an unauthorized attacker execute code. Microsoft rates it CVSS 8.8 (network, low complexity, no privileges, user interaction required), so a user has to open or load attacker-supplied content. No exploitation or public PoC found; not in CISA KEV. Trigger details are not published.

_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, fixed build per channel at aka.ms/OfficeSecurityReleases fixed no fixed version listed
- 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 365 for Mac affected < 16.115.26110837 fixed 16.115.26110837
- vendor:Microsoft Office LTSC for Mac 2021 affected >= 16.0.1, < 16.115.26110837 fixed 16.115.26110837
- vendor:Microsoft Office LTSC for Mac 2024 affected >= 16.0.0, < 16.115.26110837 fixed 16.115.26110837

## How to check

Check your Office build (Word > File > Account > About Word; on Mac Word > About Word). Windows: LTSC 2021 needs 16.0.14334.21048 or later, LTSC 2024 needs 16.0.17932.21140 or later; Microsoft 365 Apps builds are listed at https://aka.ms/OfficeSecurityReleases. Mac: Office 365 for Mac and LTSC for Mac 2021/2024 need 16.115.26110837 or later.

## Fix

Update Office to: LTSC 2021 16.0.14334.21048, LTSC 2024 16.0.17932.21140, Mac (Office 365 / LTSC 2021 / LTSC 2024) 16.115.26110837; Microsoft 365 Apps: the fixed build per channel is on https://aka.ms/OfficeSecurityReleases (not read).

## Timeline

- 2026-11-10T19:24:45+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-116722
- 2026-11-10T23:37:41+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-116722 — MSRC page is JS-only and unreadable here; used Microsoft CNA data as mirrored by NVD/OpenCVE. Not exploited, not in KEV, no PoC found. UI:R per CVSS vector (user must open a file/content). Nothing marked verified since MSRC page not read directly.

## Documents

- [advisory] NVD CVE-2026-116722 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/CVE-2026-116722

## From the sources

Heap-based buffer overflow in Microsoft Office Word 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_