CVE-2026-55121
Medium
Description
Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information locally.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Microsoft 365
PublishedJul 14, 2026
First seenJul 14, 2026
Weakness typeCWE-125Out-of-bounds read
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_2016 | 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 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.