CVE-2026-81389
High
Description
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
SeverityHigh
CVSS7.0
Exploit probability—
Product
Microsoft Excel
PublishedSep 8, 2026
First seenSep 8, 2026
Weakness typeCWE-122CWE-122
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft excel | 2016 | — |
| microsoft 365_apps | No range specified | — |
| microsoft microsoft_365 | No range specified | — |
| microsoft office_2016 | No range specified | — |
| microsoft office_2019 | No range specified | — |
| microsoft office_2021 | No range specified | — |
| microsoft office_2024 | No range specified | — |
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