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Vulnerabilities/CVE-2026-50659Public Intelligence Dossier
Source: microsoft · Limited verification•Last verified: •Collection Running
CVE-2026-50659Unknown / EvaluatingMEDIUM (raw)CVSS 6.5CWE-116

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

Published: 15 Jul 2026•Last updated: 15 Oct 2026, 03:40 AM IST•Source identifier: secure@microsoft.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance not available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
6.5MEDIUM (raw)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Metric sourcesecure@microsoft.com
EPSS probability
0.7%0.007
Percentile54th
Weakness type
CWE-116
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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

SOC priority

Medium

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

4 source-backed products
Affected products and versions (source)
  • microsoft .net framework · 4.8.1; 4.8; 4.6.2; 4.7; 4.7.1; 4.7.2; 3.5 · NVD CPE · Source
  • microsoft .net · framework 4.8.1; framework 4.8; framework 4.6.2; framework 4.7; framework 4.7.1; framework 4.7.2; >= 8.0.0 < 8.0.29; >= 9.0.0 < 9.0.18; >= 10.0.0 < 10.0.6; framework 3.5 · NVD CPE · Source
  • microsoft visual studio 2022 · >= 17.12.0 < 17.12.22; >= 17.14.0 < 17.14.36 · NVD CPE · Source
  • microsoft visual studio 2026 · >= 18.7.0 < 18.7.4 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:arm64:*, cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*, cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*, cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*, cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*, cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*, cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

No rule-based guidance for this vulnerability class

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secure@microsoft.com
Record status · verification
UPDATED · Microsoft primary source linked
CPE
cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*, cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:arm64:*, cpe:2.3:o:microsoft:windows_11_26h1:-:*:*:*:*:*:x64:*, cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*, cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x64:*, cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:x86:*, cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*, cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*, cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*, cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*

Evidence & Provenance

2 public sources
msrc.microsoft.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-50659
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-50659
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-50659"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.