CVE-2026-50508: Windows NTLM Spoofing Vulnerability

mediumCVSS 6.5CVE-2026-50508

Exposure of sensitive information to an unauthorized actor in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.

CSIRTS triage

vendor: Microsoft product: Windows Information disclosure

What: A vulnerability allows unauthorized actors to perform NTLM spoofing over a network.
Who is affected: Users of Windows with NTLM enabled are affected.
Urgency: Remediation is urgent due to the medium severity and potential for exploitation.
Action: Apply the security update provided by Microsoft.

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: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50508

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.

Moderate exploitation riskCVE-2026-505088.7% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 95% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-50508	coverage & exploitation status	NVD · CVE.org

Recent advisories for Windows NTLM Spoofing

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalexploitedCVE-2025-24054: Microsoft Windows NTLM Hash Disclosure Spoofing Vulnerabilitycisa-kev · 2025-04-17