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CVE-2026-50659: .NET Spoofing Vulnerability

mediumCVSS 6.5CVE-2026-50659
Improper encoding or escaping of output in .NET allows an authorized attacker to perform spoofing over a network.

CSIRTS triage

vendor: Microsoftproduct: .NETOther
What
An authorized attacker can perform spoofing over a network due to improper encoding or escaping of output.
Who is affected
Users of .NET applications.
Urgency
Remediation is medium urgency as it could lead to network-based attacks.
Action
Update .NET to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.5
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50659

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-50659coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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