CVE-2026-62797: Windows NTFS Elevation of Privilege Vulnerability

CSIRTS triage

What

Heap-based buffer overflow in Windows NTFS allows local privilege escalation.

Who is affected

Authorized local attackers on affected Windows systems.

Urgency

High severity (CVSS 7.8) but requires prior authorization; patch when available.

Action

Apply Windows security update addressing CVE-2026-62797.

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

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

high — CVSS 7.8

Published

2026-08-11

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62797

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.

• Low exploitation riskCVE-2026-627970.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• critical[NEW] [critical] Microsoft Windows Products: Multiple vulnerabilitiescert-bund
• unknownexploitedNCSC-2026-0284 [1.00] [M/H] Vulnerabilities patched in Microsoft Windowsncsc-nl
• highCVE-2026-62797: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges…nvd

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