medium5.5
CVE-2026-21261
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Impact
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | 365 Apps | All versions |
| Microsoft | Excel | Version 2016 |
| Microsoft | Office | Version 2019 |
| Microsoft | Office Long Term Servicing Channel | Versions 2021, 2024 |
| Microsoft | Office Online Server | before 16.0.10417.20097 |