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Findings

CVE-2026-97746

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Published Oct 13, 2026 · updated Oct 14, 2026 · Microsoft Microsoft 365

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

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

    Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

  2. Oct 14, 2026 · NIST NVD

    Updated

    Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Affected

  • 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 2021 for 32-bit editionsversion unspecified
  • microsoft Microsoft Office LTSC 2021 for 64-bit editionsversion 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
  • microsoft Office Online Serverversion unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-97746

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-97746

    30-day exploitation probability 0.7%

    first.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-97746

    Microsoft Office LTSC 2021 for 32-bit editions, Microsoft Office LTSC 2024 for 32-bit editions, Microsoft Office LTSC for Mac 2024, Office Online Server

    msrc.microsoft.com
  • NIST NVDVulnerability recordCVE-2026-97746

    Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

    nvd.nist.gov

References