---
id: "CVE-2026-112723"
page: "https://infrastack.ai/live/CVE-2026-112723"
kind: "vulnerability"
aliases: ["CVE-2026-112723"]
title: "Microsoft Word: heap buffer overflow lets a remote attacker run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Microsoft Office Word", "fixed": ["Current Channel 2610 20527.20196", "LTSC 2024 17932.21140", "LTSC 2021 14334.21048", "Office 2019 10417.20236"], "affected": "builds older than the 2026-11-10 updates", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["microsoft-office", "other", "user-interaction", "windows", "word"]
not_affected_if: []
published_at: "2026-11-10T19:18:30+00:00"
first_seen_at: "2026-11-10T19:24:30+00:00"
updated_at: "2026-11-11T00:20:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112723", "first_seen_at": "2026-11-10T19:24:30+00:00"}, {"source": "analyst", "url": "https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates", "first_seen_at": "2026-11-11T00:20:23+00:00", "cites": ["https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates", "https://www.rapid7.com/db/vulnerabilities/cve-2026-112723/"]}]
exploit_sources: []
---

# Microsoft Word: heap buffer overflow lets a remote attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-112723 (this .md is for agents)

A heap-based buffer overflow in Microsoft Office Word lets an unauthorized attacker execute code over a network. NVD rates it high (CVSS 8.8), and the sources give no further detail on the trigger.

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

## Affected

- vendor:Microsoft Office Word affected builds older than the 2026-11-10 updates fixed Current Channel 2610 20527.20196, LTSC 2024 17932.21140, LTSC 2021 14334.21048, Office 2019 10417.20236

## How to check

Open Word > File > Account > About Word and compare the version and build with the November 10, 2026 builds in Microsoft's Office security update release notes (listed under Word). A lower build is unpatched. Admins: check the update channel and that Office updates are applied via Microsoft Update or your management tool.

## Fix

Install the November 10, 2026 Office security update: Current Channel 2610 build 20527.20196 or later; Monthly Enterprise Channel 2610 20527.20194, 2609 20430.20264, 2608 20326.20320; Semi-Annual Enterprise 2610 20527.20192, 2609 20430.20262, 2608 20326.20318; Office 2024/2021 Retail 2610 20527.20196; LTSC 2024 2408 build 17932.21140; LTSC 2021 2108 build 14334.21048; Office 2019 volume 1808 build 10417.20236.

## Timeline

- 2026-11-10T19:24:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112723
- 2026-11-11T00:20:23+00:00 analyst https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates — MS Learn Office release notes list CVE under Word fixed Nov 10 2026 (builds). MSRC guide page is JS-only, not read; affected range, exploitation status unconfirmed (NVD/Rapid7: not in KEV). UI:R from CNA vector.

## Documents

- [fix] Microsoft Office security updates release notes (Nov 10, 2026) https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
- [mentions] Rapid7: CVE-2026-112723 https://www.rapid7.com/db/vulnerabilities/cve-2026-112723/

## 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_