EUVD-2026-56617
GHSA-6mq3-qc5g-p928
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local attack requiring a pre-existing low-privilege account; missing authentication grants unrestricted SYSTEM access yielding full C/I/A impact; scope unchanged as escalation stays within the compromised host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Missing authentication for critical function in Windows Remote Desktop Services allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation in Windows Remote Desktop Services affects a broad range of Windows 10, Windows 11, and Windows Server versions from 2012 through 2025, allowing a locally authenticated low-privilege attacker to elevate to full SYSTEM-level control. The root cause is CWE-306 - a critical RDS function entirely lacking an authentication gate - meaning any low-privilege account holder can invoke it without proper authorization. Microsoft has released patches across all affected product lines, though no public exploit code or CISA KEV listing was present in the available intelligence.
Technical ContextAI
Windows Remote Desktop Services (RDS) provides remote access and multi-user session hosting and ships as a core component across supported Windows versions. CWE-306 (Missing Authentication for Critical Function) indicates a specific privileged RDS function or internal API performs no authentication or authorization check before executing, rather than performing the check incorrectly. The CVSS vector AV:L/AC:L/PR:L/UI:N/S:U confirms the attack is local, requires only a pre-existing low-privilege account, imposes no special configuration or timing requirement, and needs no user interaction. The scope of affected versions - from Windows Server 2012 (build 6.2.9200.x) through Windows Server 2025 (10.0.26100.x) and across Windows 10 and 11 feature releases - indicates this missing authentication affects a broadly shared RDS code path rather than a single product variant.
RemediationAI
The primary fix is to apply the Microsoft-released security update for the specific affected Windows version; patch availability is confirmed by vendor per the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-61364, which contains the applicable KB articles per product. The exact patched build thresholds are listed in the affected products section and correspond to the EUVD data; organizations should verify their installed build number and update accordingly. For organizations running Windows Server 2012 or Server 2012 R2 - which are beyond mainstream support - enrollment in Microsoft's Extended Security Update (ESU) program is required to receive this patch, or migration to a supported server version should be prioritized. If immediate patching is not feasible, partial risk reduction can be achieved by strictly limiting the number of accounts with local logon rights on multi-user RDS hosts, enforcing least-privilege account provisioning, and auditing local account membership; note these are compensating controls only and do not close the underlying authentication gap. No exact KB article numbers were included in the provided reference data and were not independently confirmed.
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Same technique Authentication Bypass
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External POC / Exploit Code
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