EUVD-2026-56411
GHSA-wqjr-4469-q8g6
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access only; race condition demands precise timing (AC:H); low-privilege authenticated session required (PR:L); successful exploitation yields full SYSTEM-level compromise across confidentiality, integrity, and availability.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Backup Engine allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in the Windows Backup Engine component affects a broad range of Microsoft Windows client and server releases, exploitable by a local authenticated user holding standard privileges. The vulnerability stems from a race condition (CWE-362) in how the Backup Engine manages shared resources under concurrent execution, creating a timing window that a low-privileged attacker can win to gain elevated - likely SYSTEM-level - access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an active local authenticated session with at least standard user (low) privileges - the CVSS vector PR:L confirms this prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a meaningful but not trivially reproducible vulnerability: local access and high attack complexity are genuine exploitation barriers. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Microsoft has released patches for all affected Windows versions; administrators should apply the relevant cumulative update for each platform branch to advance past the fixed build thresholds confirmed by EUVD-2026-56411 - for example, Windows Server 2025 to build 10.0.26100.33296 or later, Windows Server 2022 to 10.0.20348.5499 or later, Windows 10 Version 22H2 to 10.0.19045.7663 or later, and Windows 11 Version 24H2 to 10.0.26100.9168 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enumerate all Windows systems running the Backup Engine in your environment and map them to Microsoft's affected platform list per the security advisory to establish scope. …
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External POC / Exploit Code
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