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Vulnerabilities

Vulnerability · CVE-2026-97776

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 · Microsoft Microsoft 365 Apps for Enterprise

Check if you run it

No confirmed exploitation is on record for CVE-2026-97776. EPSS is 0.78%. Act only if a listed version of Microsoft Microsoft 365 Apps for Enterprise 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
0.78%
Remediation
Advisory link
Affected products
cpe microsoft/365 apps · cpe microsoft/microsoft 365 · cpe microsoft/office 2021 · cpe microsoft/office 2024 · vendor Microsoft Microsoft 365 Apps for Enterprise · vendor Microsoft Microsoft Office 365 for Mac

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

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
  • vendor Microsoft Microsoft 365 Apps for Enterpriseversion unspecified
  • vendor Microsoft Microsoft Office 365 for Macversion unspecified
  • vendor Microsoft Microsoft Office LTSC 2021version unspecified
  • vendor Microsoft Microsoft Office LTSC 2024version unspecified
  • vendor Microsoft Microsoft Office LTSC for Mac 2021version unspecified
  • vendor Microsoft Microsoft Office LTSC for Mac 2024version unspecified
  • vendor Microsoft Office Online Serverversion unspecified

How to fix CVE-2026-97776

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-2026-97776. EPSS is 0.78%. Act only if a listed version of Microsoft Microsoft 365 Apps for Enterprise 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 0.78%. 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

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-97776

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

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-97776

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-97776

    30-day exploitation probability 0.8%

    first.org
  • NIST NVDVulnerability recordCVE-2026-97776

    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.