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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain local system access
  2. Exploit
    Interact with Windows Projected File System APIs
  3. Execution
    Bypass access control checks
  4. Impact
    Escalate privileges to SYSTEM

Vulnerability Assessment

Weakness
CWE
CWE-284
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploitation Conditions

Windows Projected File System must be enabled and accessible. Attacker requires local user account credentials (PR:L). No user interaction needed. Affects default Windows installations with ProjFS enabled.
Impact

CVSS 7.8 (HIGH). Attack vector: Local. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via local access.
Exploit ScenarioDerived

An attacker could exploit this vulnerability to compromise the affected system.
This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Windows Projected File System in Windows 11 and Server 2022 contains improper access control that enables authenticated local users to escalate privileges to system level. An attacker with valid credentials can exploit this vulnerability to gain elevated permissions without user interaction. Currently, no patch is available to address this issue.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:55 CVSS 7.8

Improper access control in Windows Projected File System allows an authorized attacker to elevate privileges locally. [CVSS 7.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch.

Affected Packages

microsoft windows_10_version_1809_10_0_17763_8511 fix: Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8511, Windows 10 Version 1809 for x64-based Systems 10.0.17763.8511
microsoft windows_10_version_21h2_10_0_19044_7058 fix: Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7058, Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7058, Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7058
microsoft windows_10_version_22h2_10_0_19045_7058 fix: Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.7058, Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.7058, Windows 10 Version 22H2 for x64-based Systems 10.0.19045.7058
microsoft windows_11_version_23h2_10_0_22631_6783 fix: Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.6783, Windows 11 Version 23H2 for x64-based Systems 10.0.22631.6783
microsoft windows_11_version_24h2_10_0_26100_8037 fix: Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8037, Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8037
microsoft windows_11_version_25h2_10_0_26200_8037 fix: Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8037, Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8037
microsoft windows_11_version_26h1_10_0_28000_1719 fix: Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.1719, Windows 11 version 26H1 for x64-based Systems 10.0.28000.1719
microsoft windows_server_2019_10_0_17763_8511 fix: Windows Server 2019 10.0.17763.8511, Windows Server 2019 (Server Core installation) 10.0.17763.8511
microsoft windows_server_2022_10_0_20348_4893 fix: Windows Server 2022 10.0.20348.4893, Windows Server 2022 (Server Core installation) 10.0.20348.4893
microsoft windows_server_2022_23h2_edition_10_0_25398_2207 fix: Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2207
microsoft windows_server_2025_10_0_26100_32522 fix: Windows Server 2025 10.0.26100.32522, Windows Server 2025 (Server Core installation) 10.0.26100.32522

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 11 packages in microsoft

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Technical ContextAI · show details

Classified as CWE-284 (Improper Access Control). Improper access control in Windows Projected File System allows an authorized attacker to elevate privileges locally.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

DescriptionCVE.org

Improper access control in Windows Projected File System allows an authorized attacker to elevate privileges locally.

Executive ViewAI

Why It Matters

CVE-2026-24290 is a privilege escalation vulnerability in Windows Projected File System that could allow authorized users to gain elevated system access. This impacts any organization running affected Windows systems and requires immediate mitigation planning, as no patch is currently available.

Business Impact: High
Compensating Controls

Disable Windows Projected File System (ProjFS) if not critical to business operations; implement strict user access controls limiting who can interact with ProjFS; enforce principle of least privilege across affected systems; monitor and audit privileged account activity; segment networks to contain potential privilege escalation impact; consider restricting local administrator access where possible.

Threat Intelligence Overview

EPSS Score
0.0%
Top 88% exploitable
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact
High

Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +39
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

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References

Advisories & patches
ADVISORY https://vuldb.com/?id.349999 REF https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24290

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