7.8
High
CVE-2026-55041 Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally
Description
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft 365 Apps for Enterprise 16.0 | 16.0.1 → latest | No fix stated |
| Microsoft Excel 2016 16.0 | 16.0.0.0 → < 16.0.5561.1001 | 16.0.5561.1001 |
| Microsoft Office 2019 19.0 | 19.0.0 → latest | No fix stated |
| Microsoft Office 365 for Mac 1.0 | 1.0.0 → < 16.111.26071215 | 16.111.26071215 |
| Microsoft Office LTSC 2021 16.0 | 16.0.1 → latest | No fix stated |
| Microsoft Office LTSC 2024 16.0 | 16.0.0 → latest | No fix stated |
| Microsoft Office LTSC for Mac 2021 16.0 | 16.0.1 → < 16.111.26071215 | 16.111.26071215 |
| Microsoft Office LTSC for Mac 2024 16.0 | 16.0.0 → < 16.111.26071215 | 16.111.26071215 |
| Office Online Server 16.0 | 16.0.0.0 → < 16.0.10417.20175 | 16.0.10417.20175 |
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