Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

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. Aug 11, 2026 · NIST NVD

   Detected

   Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

2. Oct 14, 2026 · NIST NVD

   Updated

   Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Affected

• cpe microsoft/365 appsversion unspecified
• cpe microsoft/microsoft 365version unspecified
• cpe microsoft/office 2016version unspecified
• cpe microsoft/office 2019version unspecified
• cpe microsoft/office 2021version unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-63533

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-63533

  30-day exploitation probability 0.5%

  first.org
• NIST NVDVulnerability recordCVE-2026-63533

  Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

  nvd.nist.gov

References

• Vendor Advisory · msrc.microsoft.com