---
id: "CVE-2026-111302"
page: "https://infrastack.ai/live/CVE-2026-111302"
kind: "vulnerability"
aliases: ["CVE-2026-111302"]
title: "Microsoft Word: crafted file can run code when opened (heap overflow, November 2026 Patch Tuesday)"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Office LTSC 2021", "fixed": [], "affected": "< 16.0.14334.21048", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2024", "fixed": [], "affected": "< 16.0.17932.21140", "ecosystem": "vendor"}, {"name": "Microsoft Office for Mac", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}, {"name": "Microsoft 365 Apps for Enterprise", "fixed": [], "affected": "16.0.1 up to the build in aka.ms/OfficeSecurityReleases", "ecosystem": "vendor"}]
ecosystems: []
tags: ["macos", "microsoft-office", "microsoft-word", "other", "user-interaction", "windows"]
not_affected_if: []
published_at: "2026-11-10T19:18:28+00:00"
first_seen_at: "2026-11-10T19:24:29+00:00"
updated_at: "2026-11-11T00:26:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111302", "first_seen_at": "2026-11-10T19:24:29+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/cve-2026-111302", "first_seen_at": "2026-11-11T00:26:50+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/cve-2026-111302", "https://www.zerodayinitiative.com/blog/2026/11/10/the-november-2026-security-update-review"]}]
exploit_sources: []
---

# Microsoft Word: crafted file can run code when opened (heap overflow, November 2026 Patch Tuesday)

Link for people: https://infrastack.ai/live/CVE-2026-111302 (this .md is for agents)

Heap-based buffer overflow in Microsoft Office Word (CVE-2026-111302) lets an attacker run code as the current user. Microsoft rates it CVSS 7.8: local vector, user interaction required, so a person has to open a crafted file. Fixed in the November 2026 Office 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 no fixed version listed
- vendor:Microsoft Office LTSC 2024 affected < 16.0.17932.21140 fixed no fixed version listed
- vendor:Microsoft Office for Mac affected < 16.115.26110837 fixed 16.115.26110837
- vendor:Microsoft 365 Apps for Enterprise affected 16.0.1 up to the build in aka.ms/OfficeSecurityReleases fixed no fixed version listed

## How to check

In any Office app: File > Account > About (Windows) or Word > About Word (Mac) and compare the build. Vulnerable if below: 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. For Microsoft 365 Apps, compare with the build listed at https://aka.ms/OfficeSecurityReleases for your update channel.

## Fix

Update Office to the November 2026 release: Windows LTSC 2021 16.0.14334.21048 or later, LTSC 2024 16.0.17932.21140 or later, Mac 16.115.26110837 or later; Microsoft 365 Apps to the current build for your channel (aka.ms/OfficeSecurityReleases). The boundary versions come from the NVD affected ranges (listed as less-than), so the first fixed build may be that number or the next; confirm on the MSRC page.

## Timeline

- 2026-11-10T19:24:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111302
- 2026-11-11T00:26:50+00:00 analyst https://nvd.nist.gov/vuln/detail/cve-2026-111302 — MSRC page is JS-only and unreadable here; affected/fixed builds taken from Microsoft's CNA data on NVD. Not marked verified. Not in KEV per Rapid7; no exploitation or PoC found.

## Documents

- [advisory] NVD CVE-2026-111302 (Microsoft CNA data) https://nvd.nist.gov/vuln/detail/cve-2026-111302
- [mentions] ZDI: November 2026 Security Update Review https://www.zerodayinitiative.com/blog/2026/11/10/the-november-2026-security-update-review

## From the sources

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

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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_