Windows NTFS EUVD-2026-100116

Requires the attacker to already have local, authenticated access to the Windows host with high privileges (CVSS PR:H), and to reach the vulnerable NTFS driver code path with crafted input that causes the untrusted pointer dereference (CWE-822). Limiting factors: no remote network vector (AV:L), so it cannot be triggered across the network and is unsuitable for initial access - it serves as a post-compromise escalation/execution primitive. No user interaction is needed (UI:N) and attack complexity is low (AC:L) once local access is held. Affected and unpatched builds span Windows 10/11 (1607 through 26H2) and Windows Server 2012 through 2025; applying the vendor update (e.g., Server 2025 ≥10.0.26100.33650, Win11 24H2/25H2 ≥10.0.26100.9711) removes the condition.

This is a moderate-priority local privilege-escalation/code-execution flaw that does NOT rise to emergency status despite a HIGH technical impact. The CVSS 3.1 vector (AV:L/AC:L/PR:H/UI:N) requires local access and, per Microsoft's own scoring, high existing privileges, which caps the base score at 6.7 (Medium) even though confidentiality, integrity, and availability impacts are all HIGH. CISA's SSVC framework aligns with a low-urgency posture: Exploitation=none (no observed exploitation), Automatable=no (cannot be reliably mass-scripted), and Technical Impact=total. There is no CISA KEV listing and no public proof-of-concept identified in the provided data, so the current status is 'no public exploit identified at time of analysis.' An EPSS score was not supplied and therefore cannot corroborate exploitation likelihood. One internal inconsistency should be flagged: the input Tags include 'Information Disclosure,' but the description states the vulnerability 'allows an authorized attacker to execute code locally' and the vector shows I:H/A:H - this is code execution / elevation of privilege, not merely information disclosure, so the tag appears mislabeled and should not drive triage. Net assessment: a credible post-compromise or insider escalation vector worth patching in normal cycles, not a drop-everything issue absent evidence of exploitation.

An attacker who already has authenticated local access to a Windows host (e.g., a standard foothold from phishing or a low-privilege service account) crafts input that triggers an untrusted pointer dereference in the NTFS driver, corrupting kernel-controlled memory to execute arbitrary code and elevate privileges. Because AV:L/PR:H applies, this is a local, privilege-dependent operation rather than a remote drive-by, and no user interaction is required (UI:N). No public exploit code is identified at time of analysis.