EUVD-2026-56620
GHSA-mffm-85p4-qvf5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Standard local user account suffices (PR:L, AV:L); symlink exploitation imposes no special conditions (AC:L); successful escalation to SYSTEM yields full system compromise (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Improper link resolution before file access ('link following') in Windows Accessibility Infrastructure (ATBroker.exe) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Accessibility Infrastructure (ATBroker.exe) affects a broad range of Windows 10, Windows 11, and Windows Server releases through a symlink-following flaw (CWE-59). An authenticated local attacker can manipulate file system links to redirect ATBroker.exe file access operations, enabling elevation from a standard user account to SYSTEM-level privileges across default Windows installations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a valid authenticated local user session on the target Windows system, corresponding to PR:L in the CVSS vector - remote unauthenticated exploitation is not possible given the AV:L attack vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 score accurately reflects a classic local privilege escalation pattern: AV:L confirms that physical or session-level access to the target is required, PR:L establishes that a standard authenticated account suffices without administrator rights, and AC:L indicates that the exploitation technique is not complex. … 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 for CVE-2026-61358 via Windows Update, WSUS, or Microsoft Update Catalog, targeting the following minimum fixed builds per version: 10.0.17763.9115 for Windows Server 2019 and Windows 10 Version 1809; 10.0.19044.7663 for Windows 10 Version 21H2; 10.0.19045.7663 for Windows 10 Version 22H2; 10.0.20348.5499 for Windows Server 2022; 10.0.22631.7517 for Windows 11 Version 23H2; 10.0.26100.9168 for Windows 11 Version 24H2; 10.0.26100.33296 for Windows Server 2025; 10.0.26200.9168 for Windows 11 Version 25H2; and 10.0.28000.2704 for Windows 11 version 26H1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, Windows 11, and Windows Server systems and assess patch management infrastructure readiness. …
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External POC / Exploit Code
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