CVE-2026-21218 HIGH

CVE-2026-21218: .NET Spoofing Vulnerability

Vendor Microsoft
Product .NET 10.0
Weakness CWE-166
Published February 10, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.

Key dates

02Disclosure timeline

February 10, 2026 CVE published
May 11, 2026 Record updated