---
id: "CVE-2026-118702"
page: "https://infrastack.ai/live/CVE-2026-118702"
kind: "vulnerability"
aliases: ["CVE-2026-118702"]
title: "Microsoft Excel: double free lets a remote 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": "< 16.0.14334.21048", "ecosystem": "vendor"}, {"name": "Microsoft Office LTSC 2024", "fixed": ["16.0.17932.21140"], "affected": "< 16.0.17932.21140", "ecosystem": "vendor"}, {"name": "Microsoft Office for Mac", "fixed": ["16.115.26110837"], "affected": "< 16.115.26110837", "ecosystem": "vendor"}, {"name": "Microsoft 365 Apps for Enterprise", "fixed": [], "affected": ">= 16.0.1, fixed build per aka.ms/OfficeSecurityReleases", "ecosystem": "vendor"}]
ecosystems: []
tags: ["excel", "macos", "microsoft-office", "other", "user-interaction", "windows"]
not_affected_if: []
published_at: "2026-11-10T19:19:44+00:00"
first_seen_at: "2026-11-10T19:24:52+00:00"
updated_at: "2026-11-10T23:10:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118702", "first_seen_at": "2026-11-10T19:24:52+00:00"}, {"source": "analyst", "url": "https://app.opencve.io/cve/CVE-2026-118702", "first_seen_at": "2026-11-10T23:10:32+00:00", "cites": ["https://app.opencve.io/cve/CVE-2026-118702"]}]
exploit_sources: []
---

# Microsoft Excel: double free lets a remote attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-118702 (this .md is for agents)

Double free (CWE-415) in Microsoft Office Excel. A remote attacker can run code, but the victim has to open a crafted file (CVSS 8.8, UI:R). Microsoft's CVE record lists fixed builds for Microsoft 365 Apps, Office LTSC 2021 and 2024, and Office for Mac. No exploitation is reported.

_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 affected < 16.115.26110837 fixed 16.115.26110837
- vendor:Microsoft 365 Apps for Enterprise affected >= 16.0.1, fixed build per aka.ms/OfficeSecurityReleases fixed no fixed version listed

## How to check

In Excel go to File > Account > About Excel and compare the build number with the fixed builds. On Mac, check Excel > About Excel. Microsoft 365 Apps builds are listed at https://aka.ms/OfficeSecurityReleases.

## Fix

Update Office to a build at or above: LTSC 2021 16.0.14334.21048; LTSC 2024 16.0.17932.21140; Office for Mac and LTSC for Mac 2021/2024 16.115.26110837. For Microsoft 365 Apps, use the current build listed at https://aka.ms/OfficeSecurityReleases.

## Timeline

- 2026-11-10T19:24:52+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118702
- 2026-11-10T23:10:32+00:00 analyst https://app.opencve.io/cve/CVE-2026-118702 — MSRC page is JS-only and could not be read; affected/fixed builds taken from Microsoft's CNA record as mirrored by OpenCVE/NVD. Nothing marked verified. No exploitation reported (CISA KEV: no). Did not search X.

## Documents

- [describes] OpenCVE: CVE-2026-118702 (mirrors Microsoft CNA record) https://app.opencve.io/cve/CVE-2026-118702

## From the sources

Double free in Microsoft Office Excel 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_