CVE-2026-50659
.NET Spoofing Vulnerability
MEDIUM
6.5
CVSS Score
Published: July 14, 2026 at 07:40 PM UTC
Updated: October 28, 2026 at 08:17 PM UTC
4 products affected across 1 vendor.NET FrameworkVisual Studio 2022.net· also runs on 15 platforms
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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit
Description
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 10.0.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.0.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.50727.8983 & 3.0.30729.8978, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.7.4143.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.8.4803.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.29, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.18, so it looks safe — our inference, not a vendor statement
apple-macos (environment) · linux-linux-kernel (environment) · microsoft-windows (environment)
Affected range stops below 2.0.50727.8983 & 3.0.30729.8978, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.7.4143.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.8.4803.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.8.9340.0, so it looks safe — our inference, not a vendor statement
microsoft-windows-10-1607 (environment) · microsoft-windows-10-1809 (environment) · microsoft-windows-10-21h2 (environment) · microsoft-windows-10-22h2 (environment) · microsoft-windows-11-23h2 (environment) · microsoft-windows-11-24h2 (environment) · microsoft-windows-11-25h2 (environment) · microsoft-windows-11-26h1 (environment) · microsoft-windows-server-2012 (environment) · microsoft-windows-server-2016 (environment) · microsoft-windows-server-2019 (environment) · microsoft-windows-server-2022 (environment)
Affected range stops below 17.12.22, so it looks safe — our inference, not a vendor statement
Affected range stops below 17.14.36, so it looks safe — our inference, not a vendor statement
18.7.0 ≤ v < 18.7.418.0
Affected range stops below 18.7.4, so it looks safe — our inference, not a vendor statement
Runs on — not affected
The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659SSVC — Action Prioritization
SSVCNo known exploitNot automatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
6.5MEDIUMmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-116
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