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CVE-2026-50309: Windows NTFS Remote Code Execution Vulnerability

highCVSS 7.8CVE-2026-50309
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.

CSIRTS triage

vendor: Microsoftproduct: Windows NTFSRemote code execution
What
Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.
Who is affected
Authorized users of Windows NTFS.
Urgency
Remediation is urgent due to the high severity and potential for remote code execution.
Action
Apply the security patch released 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
high — CVSS 7.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50309

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-2026-50309coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Windows NTFS Remote

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.

More from Microsoft Security Response Center