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Medium severity · published Jul 14, 2026
CVE-2026-50659
.NET Spoofing Vulnerability
6.5
CVSS
0.7%
EPSS
No
On KEV
Description
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
N1
.NET 10.0 · Microsoft
10.0.0 before 10.0.10 · source: vendor
N8
.NET 8.0 · Microsoft
8.0.0 before 8.0.29 · source: vendor
N9
.NET 9.0 · Microsoft
9.0.0 before 9.0.18 · source: vendor
MN
Microsoft .NET Framework 3.5 · Microsoft
3.5.0 before 2.0.50727.8983 & 3.0.30729.8978 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.7.2 · Microsoft
4.7.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8 · Microsoft
4.8.0 before 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 · source: vendor
MN
Microsoft .NET Framework 3.5 AND 4.8.1 · Microsoft
4.8.1 before 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 · source: vendor
MN
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 · Microsoft
4.7.0 before 4.7.4143.0 · source: vendor
MN
Microsoft .NET Framework 4.8 · Microsoft
4.8.0 before 4.8.4803.0 · source: vendor
MN
Microsoft .NET Framework 4.8.1 · Microsoft
4.8.0.0 before 4.8.9340.0 · source: vendor
MV
Microsoft Visual Studio 2022 version 17.12 · Microsoft
17.12.0 before 17.12.22 · source: vendor
MV
Microsoft Visual Studio 2022 version 17.14 · Microsoft
17.14.0 before 17.14.36 · source: vendor
Affected product
N1
.NET 10.0
Microsoft
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-50659
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-50659
vendor-advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659
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