CVE-2026-55055
High
Description
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
SeverityHigh
CVSS7.8
Exploit probability47. percentile0.6%
Product
Microsoft 365
PublishedJul 14, 2026
First seenJul 14, 2026
Weakness typeCWE-121CWE-121
How to fix
Update
- microsoft sharepoint_server16.0.19725.20434 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft microsoft_365 | No range specified | — |
| microsoft 365_apps | No range specified | — |
| microsoft office_2019 | No range specified | — |
| microsoft office_2021 | No range specified | — |
| microsoft office_2024 | No range specified | — |
| microsoft sharepoint_server | v < 16.0.19725.20434, 2016, 2019 | 16.0.19725.20434 |
| microsoft word | 2016 | — |
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