EUVD-2026-44291
GHSA-8h8w-xq32-r3wr
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated low-priv attacker (AV:L/PR:L), no interaction or complexity, elevating to SYSTEM yields full C/I/A impact within an unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Improper authorization in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in Microsoft Windows Installer (msiexec/MSI service) lets an already-authenticated low-privilege user elevate to SYSTEM by abusing an improper authorization check (CWE-285). Affected platforms span Windows 10 (1607 through 22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025, including Server Core installations. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local, authenticated, low-privilege (standard user) access to the target Windows host - the CVSS vector is AV:L/AC:L/PR:L/UI:N, so it is not remotely reachable and cannot be triggered by an anonymous network attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.8) describes a locally-exploitable, low-complexity flaw that requires the attacker to already hold low-level (authenticated, non-admin) privileges and no user interaction, yielding full confidentiality, integrity, and availability impact on the host - consistent with EoP to SYSTEM. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged authenticated session on a Windows host - for example via a phished user account or a compromised low-priv service - invokes a crafted Windows Installer operation that the component fails to properly authorize, causing a privileged action to execute in their context and granting SYSTEM-level control. Given AV:L/AC:L, the technique is reliable and requires no user interaction once local access exists; no public POC is identified at time of analysis. |
| Remediation | Apply the Microsoft security update for CVE-2026-58540 (Patch available per vendor advisory) via Windows Update, WSUS, or your patch-management system; consult the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58540 for the exact KB and fixed build for each affected OS version, as the record does not publish a single cross-product fix version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10 (versions 1607-22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2012-2025 systems in your environment; prioritize production servers and workstations supporting administrative or sensitive data access. …
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Same weakness CWE-285 – Improper Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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