EUVD-2026-56638
GHSA-2rpv-2fr2-r2m9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access and low-privilege account required (AV:L/PR:L); no special configuration or complexity (AC:L/UI:N); full C/I/A reflects SYSTEM-level access post-escalation with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Insufficient granularity of access control in User-Mode Power Service (UMPS) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows User-Mode Power Service (UMPS) affects a broad swath of Windows 10, Windows 11, and Windows Server releases from Server 2012 through Server 2025. An authenticated low-privileged local user can exploit insufficient access control granularity (CWE-1220) in UMPS to elevate privileges, achieving full confidentiality, integrity, and availability impact consistent with SYSTEM-level access. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid, low-privileged local user account on the target Windows system (PR:L per CVSS vector) - standard domain users or local accounts with basic login rights qualify. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.8 High with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H reflects a locally exploitable, low-complexity privilege escalation with no required user interaction and a full-impact triad post-escalation - a realistic and serious threat in multi-user or managed Windows environments. … 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 | Apply Microsoft's vendor-released patch via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all Windows 10, Windows 11, and Server 2012-2025 systems in production and categorize by criticality; verify patch compatibility and test in isolated lab environments. …
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External POC / Exploit Code
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