Vulnerability Description
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
CVSS Score
6.6
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | 365 Apps | - |
| Microsoft | Excel | 2016 |
| Microsoft | Microsoft 365 | - |
| Microsoft | Office 2019 | - |
| Microsoft | Office 2021 | - |
| Microsoft | Office 2024 | - |
| Microsoft | Office Online Server | < 16.0.10417.20175 |
Related Weaknesses (CWE)
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50678PatchVendor Advisory
FAQ
What is CVE-2026-50678?
CVE-2026-50678 is a vulnerability with a CVSS score of 6.6 (MEDIUM). Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
How severe is CVE-2026-50678?
CVE-2026-50678 has been rated MEDIUM with a CVSS base score of 6.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-50678?
Check the references section above for vendor advisories and patch information. Affected products include: Microsoft 365 Apps, Microsoft Excel, Microsoft Microsoft 365, Microsoft Office 2019, Microsoft Office 2021.