EUVD-2026-56678
GHSA-mwg8-c87h-qx3q
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low-privilege requirement confirmed by description; low complexity and no UI align with reliable symlink-following exploitation achieving full SYSTEM impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Improper link resolution before file access ('link following') in Windows User Profile Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows User Profile Service affects all major current Windows client and server releases, allowing any authenticated local user to gain SYSTEM-level privileges by exploiting improper symlink or junction-point resolution (CWE-59). The CVSS vector (AV:L/AC:L/PR:L/UI:N) confirms low attack complexity with no user interaction required - a standard domain or local account is sufficient. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session on the target Windows system - the CVSS PR:L metric confirms a low-privileged (standard user) account is sufficient; no administrator or special group membership is needed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High rating is well-calibrated: AV:L requires local access, PR:L limits exploitation to authenticated users, but AC:L and UI:N mean no race condition or victim cooperation is needed, making reliable exploitation straightforward once access is obtained. … 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 the Microsoft security update via Windows Update, WSUS, or Microsoft Update Catalog targeting the fixed build numbers: Windows 10 21H2 build 10.0.19044.7663 or later, Windows 10 22H2 build 10.0.19045.7663 or later, Windows 11 23H2 build 10.0.22631.7517 or later, Windows 11 24H2 / Server 2025 build 10.0.26100.9168 (client) or 10.0.26100.33296 (server) or later, Windows 11 25H2 build 10.0.26200.9168 or later, Windows 11 26H1 build 10.0.28000.2704 or later, and Windows Server 2022 build 10.0.20348.5499 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows systems running current client and server editions and assess patch readiness; prioritize systems with high-value services or sensitive data access. …
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Same weakness CWE-59 – Improper Link Resolution Before File Access
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External POC / Exploit Code
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