CVE-2026-40357
High
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Microsoft Sharepoint Server
PublishedMay 12, 2026
First seenMay 12, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- microsoft sharepoint_server16.0.19725.20280 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft sharepoint_server | v < 16.0.19725.20280, 2016, 2019 | 16.0.19725.20280 |
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.