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Vulnerabilities

Vulnerability · CVE-2026-50659

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

Published Jul 14, 2026 · catalog updated Oct 14, 2026 · .net framework

Check if you run it

No confirmed exploitation is on record for CVE-2026-50659. EPSS is 0.74%. Act only if a listed version of .net framework is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.74%
Remediation
Advisory link
Affected products
cpe microsoft/.net · cpe microsoft/.net framework

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/.netversion unspecified
  • cpe microsoft/.net framework3.5
  • cpe microsoft/.net framework4.6.2
  • cpe microsoft/.net framework4.7
  • cpe microsoft/.net framework4.7.1
  • cpe microsoft/.net framework4.7.2
  • cpe microsoft/.net framework4.8
  • cpe microsoft/.net framework4.8.1

How to fix CVE-2026-50659

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-50659. EPSS is 0.74%. Act only if a listed version of .net framework is installed.

Which versions are affected?

Compare what you have installed with microsoft/.net framework 3.5; microsoft/.net framework 4.6.2; microsoft/.net framework 4.7; microsoft/.net framework 4.7.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-116. EPSS 0.74%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 14, 2026 · NIST NVD

    Detected

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

  2. Oct 14, 2026 · NIST NVD

    Updated

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

Sources

  • CVE.orgVulnerability recordCVE-2026-50659

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-50659

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-50659

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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.