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CVE record · CVE-2026-100212

Microsoft Office Excel Remote Code Execution Vulnerability

CVSS 8.8 HighEPSS 0.0091 · 60th percentile

Published by the CVE Program (CNA: microsoft) at 13 Oct 2026, 19:01 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Microsoft 365 Apps for Enterprise
  • affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases custom
Microsoft Microsoft Office 365 for Mac
  • affected 1.0.0 to before 16.114.26101123 custom
Microsoft Microsoft Office LTSC 2021
  • affected 16.0.1 to before 16.0.14334.20974 custom
Microsoft Microsoft Office LTSC 2024
  • affected 16.0.0 to before 16.0.17932.21056 custom
Microsoft Microsoft Office LTSC for Mac 2021
  • affected 16.0.1 to before 16.114.26101123 custom
Microsoft Microsoft Office LTSC for Mac 2024
  • affected 16.0.0 to before 16.114.26101123 custom
Microsoft Office Online Server
  • affected 16.0.0.0 to before 16.0.10417.20228 custom
Identifiers
CVE-2026-100212
CNA
microsoft
Weakness (CWE)
CWE-416
Tags
Published
13 Oct 2026
Updated
31 Oct 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.0091, the 60th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 13 Oct 2026, 19:01 UTC Confirmed by the CVE List
  2. 31 Oct 2026, 16:31 UTC First seen by agentprime

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.