CVE-2026-21218

HIGH
2026-02-10 [email protected] GHSA-qvhc-9v3j-5rfw
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

3
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 7.5

Tags

Dotnet .Net

Description

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

Analysis

.NET applications are vulnerable to spoofing attacks due to improper validation of a required security element, allowing unauthenticated remote attackers to forge or manipulate application data over the network. This vulnerability affects multiple .NET versions and currently has no available patch, exposing organizations to authentication bypass and data integrity risks. …

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Remediation

Within 24 hours: Identify and inventory all .NET applications and services in production; assess which systems process authentication or handle sensitive transactions. Within 7 days: Implement network segmentation to isolate critical .NET systems; enable enhanced logging for authentication events; brief incident response team on escalation procedures. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +38
POC: 0

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CVE-2026-21218 vulnerability details – vuln.today
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