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Severity by source

NVD PRIMARY
7.0 HIGH
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
ENISA EUVD
HIGH
qualitative
CIRCL (temporal)
6.1 MEDIUM
cvss

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 23, 2026 - 21:24 vuln.today
CVE Published
May 12, 2026 - 16:59 nvd
HIGH 7.0

DescriptionCVE.org

Use after free in Windows Projected File System allows an authorized attacker to elevate privileges locally.

AnalysisAI

Local privilege escalation in the Windows Projected File System (ProjFS) affects the full supported Windows line — Windows 10 (1809/21H2/22H2), Windows 11 (22H3 through 26H1), and Windows Server 2019/2022/2025 — where a use-after-free (CWE-416) lets an authenticated local user corrupt kernel/service memory and elevate to higher privileges. Microsoft-reported and patched, the flaw carries total technical impact per CISA SSVC but has no public exploit identified at time of analysis and a very low EPSS (0.04%). The high attack complexity (AV:L/AC:H) reflects a race-condition-style UAF that is non-trivial to win reliably.

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CVE-2026-34340 vulnerability details – vuln.today

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