7.8
High
CVE-2026-20946 Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally
Description
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft Office 2019 19.0 | 19.0.0 → latest | No fix stated |
| Microsoft 365 Apps for Enterprise 16.0 | 16.0.1 → latest | No fix stated |
| Microsoft Office LTSC for Mac 2021 16.0 | 16.0.1 → < 16.105.26011018 | 16.105.26011018 |
| 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 2024 16.0 | 16.0.0 → < 16.105.26011018 | 16.105.26011018 |
| Microsoft Excel 2016 16.0 | 16.0.0.0 → < 16.0.5535.1000 | 16.0.5535.1000 |
Other CVEs of Microsoft Office 2019
The 696 CVEs of Microsoft Office 2019 →
CVE-2026-62804
External control of file name or path in Microsoft Office Word allows an unauthorized attacker to execute code locally
7.8
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CVE-2026-85875
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally
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CVE-2026-83949
Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally
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CVE-2026-83951
Buffer over-read in Microsoft Office Word allows an unauthorized attacker to disclose information locally
5.5
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