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Vulnerabilities

Vulnerability · CVE-2026-100211

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Published Oct 13, 2026 · catalog updated Oct 15, 2026 · Microsoft Microsoft 365

Check if you run it

No confirmed exploitation is on record for CVE-2026-100211. EPSS is 0.82%. Act only if a listed version of Microsoft Microsoft 365 is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.82%
Remediation
Advisory link
Affected products
cpe microsoft/365 apps · cpe microsoft/microsoft 365 · cpe microsoft/office 2021 · cpe microsoft/office 2024 · microsoft Microsoft Office 365 for Mac · microsoft Microsoft Office LTSC 2024 for 32-bit editions

Affected Microsoft products: Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC for Mac 2021.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/365 appsversion unspecified
  • cpe microsoft/microsoft 365version unspecified
  • cpe microsoft/office 2021version unspecified
  • cpe microsoft/office 2024version unspecified
  • microsoft Microsoft Office 365 for Macversion unspecified
  • microsoft Microsoft Office LTSC 2024 for 32-bit editionsversion unspecified
  • microsoft Microsoft Office LTSC 2024 for 64-bit editionsversion unspecified
  • microsoft Microsoft Office LTSC for Mac 2021version unspecified
  • microsoft Microsoft Office LTSC for Mac 2024version unspecified

How to fix CVE-2026-100211

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-100211. EPSS is 0.82%. Act only if a listed version of Microsoft Microsoft 365 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free. EPSS 0.82%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

    Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

  2. Oct 14, 2026 · NIST NVD

    Updated

    Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

  3. Oct 15, 2026 · NIST NVD

    Updated

    Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-100211

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-100211

    30-day exploitation probability 0.8%

    first.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-100211

    Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office 365 for Mac, Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2024

    msrc.microsoft.com
  • NIST NVDVulnerability recordCVE-2026-100211

    Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

    nvd.nist.gov
  • Cisco TalosVendor advisoryCVE-2026-100211

    Microsoft has released its monthly security update for October 2026, which includes 1415 vulnerabilities affecting a range of products, including 85 that Microsoft marked as "critical."

    blog.talosintelligence.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.