EUVD-2026-56331
GHSA-2vf2-4vx3-c2c5
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 and CVSS; full CIA impact reflects achievable SYSTEM-level takeover via LPE with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Incorrect authorization in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Windows Installer (msiexec) affects virtually the entire modern Windows ecosystem - from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through 2025 - via an incorrect authorization flaw (CWE-863). An attacker with low-privilege authenticated local access can exploit the broken authorization check within the Installer service to elevate to SYSTEM-level privileges, achieving full confidentiality, integrity, and availability impact on the host. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to have an authenticated local session on the target system with at least low-privilege credentials (confirmed by CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 High score is consistent with the local privilege escalation class: AV:L constrains exploitation to hosts where the attacker already has a foothold, meaningfully limiting the initial attack surface. … 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 | The primary remediation is applying Microsoft's security update through Windows Update, WSUS, or Microsoft Update Catalog to reach the fixed build versions: Windows 10 1607 and Server 2016 to 10.0.14393.9418 or later, Windows 10 1809 and Server 2019 to 10.0.17763.9115 or later, Windows 10 21H2 to 10.0.19044.7663 or later, Windows 10 22H2 to 10.0.19045.7663 or later, Windows 11 23H2 to 10.0.22631.7517 or later, Windows 11 24H2 to 10.0.26100.9168 or later, Windows Server 2025 to 10.0.26100.33296 or later, Windows 11 25H2 to 10.0.26200.9168 or later, Windows 11 26H1 to 10.0.28000.2704 or later, Server 2012 to 6.2.9200.26279 or later, Server 2012 R2 to 6.3.9600.23337 or later, and Server 2022 to 10.0.20348.5499 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (1607+), Windows 11, and Windows Server (2012-2025) systems in your environment and prioritize systems handling sensitive data or acting as infrastructure pivot points. …
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Same weakness CWE-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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