CVE-2026-21218: .NET Spoofing Vulnerability
Microsoft · .NET 10.0
Vendor fix available · Affected: Microsoft .NET 10.0 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 63% of scored CVEs
DescriptionCVE.org
Improper handling of missing special element in .NET allows an unauthorized attacker to perform spoofing over a network.
Affected products3
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Microsoft · .NET 10.0from 10.0.0 before 10.0.3
- Microsoft · .NET 8.0from 8.0.0 before 8.0.24
- Microsoft · .NET 9.0from 9.0.0 before 9.0.13
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Microsoft
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-21218 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.