---
id: "CVE-2026-123382"
page: "https://infrastack.ai/live/CVE-2026-123382"
kind: "vulnerability"
aliases: ["CVE-2026-123382"]
title: "Microsoft Outlook: untrusted pointer dereference lets a network attacker run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"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"}]
ecosystems: []
tags: ["desktop", "microsoft-office", "other", "outlook", "windows"]
not_affected_if: ["unknown"]
published_at: "2026-11-10T19:20:41+00:00"
first_seen_at: "2026-11-10T19:25:12+00:00"
updated_at: "2026-11-10T21:33:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123382", "first_seen_at": "2026-11-10T19:25:12+00:00"}, {"source": "analyst", "url": "https://radar.offseq.com/threat/cve-2026-123382-cwe-822-untrusted-pointer-dereference-in-microsoft-microsoft-365-apps-for-enterprise-8c3e6a4c7e694c41", "first_seen_at": "2026-11-10T21:33:23+00:00", "cites": ["https://radar.offseq.com/threat/cve-2026-123382-cwe-822-untrusted-pointer-dereference-in-microsoft-microsoft-365-apps-for-enterprise-8c3e6a4c7e694c41"]}]
exploit_sources: []
---

# Microsoft Outlook: untrusted pointer dereference lets a network attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-123382 (this .md is for agents)

Untrusted pointer dereference (CWE-822) in Microsoft Office Outlook lets an unauthenticated attacker run code over a network. CVSS 8.8 (AV:N/PR:N/UI:R), so a user must take an action such as opening a message. Fixed in the November 2026 Office updates. No exploitation or public PoC reported.

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

## Affected

- 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

## How to check

In Outlook, open File > Office Account > About Outlook and compare the build. LTSC 2021 needs 16.0.14334.21048 or later. LTSC 2024 needs 16.0.17932.21140 or later. Microsoft 365 Apps: check you are on the 10 Nov 2026 builds (Current Channel 2610 build 20527.20196). Confirm against the MSRC entry.

## Fix

Install the November 2026 Office security updates: LTSC 2021 16.0.14334.21048, LTSC 2024 16.0.17932.21140, Microsoft 365 Apps via Current/Monthly Enterprise channel builds dated 10 Nov 2026 (secondhand, confirm on MSRC).

## Timeline

- 2026-11-10T19:25:12+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123382
- 2026-11-10T21:33:23+00:00 analyst https://radar.offseq.com/threat/cve-2026-123382-cwe-822-untrusted-pointer-dereference-in-microsoft-microsoft-365-apps-for-enterprise-8c3e6a4c7e694c41 — MSRC page is JS-only and unreadable here; NVD empty. Data from OffSeq relaying the CNA record (second-hand), so nothing marked verified. BleepingComputer's Outlook zero-day is a different (spoofing) CVE; no exploitation reported for this one.

## Documents

- [describes] OffSeq: CVE-2026-123382 (relays CNA data) https://radar.offseq.com/threat/cve-2026-123382-cwe-822-untrusted-pointer-dereference-in-microsoft-microsoft-365-apps-for-enterprise-8c3e6a4c7e694c41

## From the sources

Untrusted pointer dereference in Microsoft Office Outlook 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_