medium6.5
CVE-2026-55054
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
Impact
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | 365 Apps | All versions |
| Microsoft | Excel | Version 2016 |
| Microsoft | Office | Version 2019 |
| Microsoft | Office 2021 | before 16.111.26071215 All versions |
| Microsoft | Office 2024 | before 16.111.26071215 All versions |
| Microsoft | Office Online Server | before 16.0.10417.20175 |
| Microsoft | Office 365 | before 16.111.26071215 |
| Microsoft | Microsoft 365 Apps For Enterprise | from 16.0.1 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Excel 2016 | from 16.0.0.0 before 16.0.5561.1001 |
| Microsoft | Microsoft Office 2019 | from 19.0.0 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office 365 For Mac | from 1.0.0 before 16.111.26071215 |
| Microsoft | Microsoft Office LTSC 2021 | from 16.0.1 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC 2024 | from 16.0.0 before https://aka.ms/OfficeSecurityReleases |
| Microsoft | Microsoft Office LTSC For Mac 2021 | from 16.0.1 before 16.111.26071215 |
| Microsoft | Microsoft Office LTSC For Mac 2024 | from 16.0.0 before 16.111.26071215 |
| Microsoft | Office Online Server | from 16.0.0.0 before 16.0.10417.20175 |