CVE-2026-45463
High
Description
Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.
SeverityHigh
CVSS8.4
Exploit probability—
Product
Microsoft 365
PublishedJun 9, 2026
First seenJun 9, 2026
Weakness typeCWE-191CWE-191CWE-121CWE-121
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft microsoft_365 | No range specified | — |
| microsoft 365_apps | No range specified | — |
| microsoft 365_copilot | 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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