High MSRC-CVE-2026-50659 1 CVE

.NET Spoofing Vulnerability

Published Jul 14, 2026 · Updated Aug 7, 2026 · Revision 4

Vendor: Microsoft

Summary

Impact: Spoofing. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

Security updates
17.12.22 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
10.0.10 — https://support.microsoft.com/kb/5104034
8.0.29 — https://support.microsoft.com/kb/5104032
9.0.18 — https://support.microsoft.com/kb/5104033
4.8.4803.0 — https://support.microsoft.com/help/5101007
4.8.4803.0 — https://support.microsoft.com/help/5101009
4.8.4803.0 — https://support.microsoft.com/help/5101011
2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0 — https://support.microsoft.com/help/5101008
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 — https://support.microsoft.com/help/5101010
2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0 — https://support.microsoft.com/help/5101006
2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0 — https://support.microsoft.com/help/5100989
2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0 — https://support.microsoft.com/help/5099535
4.7.4143.0 — https://support.microsoft.com/help/5100990
4.7.4143.0 — https://support.microsoft.com/help/5100991
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101005
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101000
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0 — https://support.microsoft.com/help/5100998
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101004
2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0 — https://support.microsoft.com/help/5101001
2.0.50727.8983 & 3.0.30729.8978 — https://support.microsoft.com/help/5100984
2.0.50727.8983 & 3.0.30729.8978 — https://support.microsoft.com/help/5100985
4.8.9340.0 — https://support.microsoft.com/help/5101002
2.0.50727.9182 & 3.0.30729.9168 — https://support.microsoft.com/help/5101014
18.7.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes

Vulnerabilities 1

Medium 6.5

CVE-2026-50659

.NET Spoofing Vulnerability

Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

Microsoft Microsoft Visual Studio 2022 version 17.14 Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 Microsoft .NET Framework 3.5 AND 4.8 Ubuntu Alpine Wolfi NuGet

Jul 14, 2026

Revision history

2026-08-07 #4
Acknowledgement Updated
2026-07-21 #3
Updated product information in the Software Update table. This is an informational change only.
2026-07-20 #2
Updated product information in the Software Update table. This is an informational change only.
2026-07-14 #1
Information published.

References

CVE-2026-50659 .NET Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss