CVE-2026-102866
High
Description
Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Microsoft Sharepoint Server
PublishedOct 13, 2026
First seenOct 13, 2026
Weakness typeCWE-347CWE-347
How to fix
Update
- microsoft sharepoint_server16.0.20326.20190 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft sharepoint_server | v < 16.0.20326.20190 | 16.0.20326.20190 |
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