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Vulnerabilities

Vulnerability · CVE-2026-97757

Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

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

Check if you run it

No confirmed exploitation is on record for CVE-2026-97757. EPSS is 0.72%. Act only if a listed version of 365 apps is installed.

Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.72%
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 2021 for 32-bit editions

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

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 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

How to fix CVE-2026-97757

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-2026-97757. EPSS is 0.72%. Act only if a listed version of 365 apps 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-122: Heap-based Buffer Overflow. EPSS 0.72%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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

    Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

  2. Oct 14, 2026 · NIST NVD

    Updated

    Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

  3. Oct 15, 2026 · NIST NVD

    Updated

    Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Sources

  • CVE.orgVulnerability recordCVE-2026-97757

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-97757

    30-day exploitation probability 0.7%

    first.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-97757

    Microsoft Office LTSC 2024 for 64-bit editions, Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC 2021 for 32-bit editions, Office Online Server

    msrc.microsoft.com
  • NIST NVDVulnerability recordCVE-2026-97757

    Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

    nvd.nist.gov

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.