VDB
CVE-2026-55039
CVE-2026-55039
PUBLISHED
CVSS 7.8 HIGH
Reported by microsoft · Published July 14, 2026
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Risk Scores
CVSS 3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1 |
| Microsoft | Microsoft Excel 2016 | 16.0.0.0 |
| Microsoft | Microsoft Office 2019 | 19.0.0 |
| Microsoft | Microsoft Office 365 for Mac | 1.0.0 |
| Microsoft | Microsoft Office LTSC 2021 | 16.0.1 |
| Microsoft | Microsoft Office LTSC 2024 | 16.0.0 |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1 |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0 |
| Microsoft | Office Online Server | 16.0.0.0 |
| Microsoft | Microsoft Office 365 for Mac | 1.0.0, 1.0.0, 1.0.0 |
| Microsoft | Microsoft Office LTSC for Mac 2021 | 16.0.1, 16.0.1, 16.0.1 |
| microsoft | office_macos_2021 | 16.0.1, 16.0.1, 16.0.1 |
| Microsoft | Microsoft Office 2019 | 19.0.0, 19.0.0, 19.0.0 |
| microsoft | office_2019 | 19.0.0, 19.0.0, 19.0.0 |
| microsoft | excel_2016 | 16.0.0.0, 16.0.0.0, 16.0.0.0 |
| Microsoft | Office Online Server | 16.0.0.0, 16.0.0.0, 16.0.0.0 |
| Microsoft | Microsoft 365 Apps for Enterprise | 16.0.1, 16.0.1, 16.0.1 |
| Microsoft | Microsoft Office LTSC for Mac 2024 | 16.0.0, 16.0.0, 16.0.0 |
| microsoft | office_macos_2024 | 16.0.0, 16.0.0, 16.0.0 |
| microsoft | office_365 | 1.0.0, 1.0.0, 1.0.0 |
…and 6 more
Timeline
- Jul 14, 2026 CVE Published
- Jul 15, 2026 Coalition ESS Score
- Jul 16, 2026 Security Advisory
- Aug 7, 2026 CVE Updated
- Aug 8, 2026 Security Advisory
References
- Microsoft Excel Remote Code Execution Vulnerability vendor-advisorypatch