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

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 14, 2026 · Tenable CVE Database

   Detected

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

2. Oct 15, 2026 · NIST NVD

   Updated

   Heap-based buffer overflow 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
• 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

Sources

• CIRCL Vulnerability LookupVulnerability recordCVE-2026-97780

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

  vulnerability.circl.lu
• CVE.orgVulnerability recordCVE-2026-97780

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-97780

  30-day exploitation probability 0.8%

  first.org
• NIST NVDVulnerability recordCVE-2026-97780

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

  nvd.nist.gov
• Tenable CVE DatabaseVulnerability recordCVE-2026-97780

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

  tenable.com

References

• Patch · msrc.microsoft.com