EUVD-2026-43876
GHSA-hpv9-6w7w-qfg9
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation via a low-priv authenticated user against a SYSTEM-level installer service, no user interaction and low complexity, yielding full C/I/A impact in 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 privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Install Service (Windows Installer) affects supported Windows 10, Windows 11, and Windows Server 2019-2025 builds, letting an already-authenticated local user with limited rights (PR:L) elevate to SYSTEM. The flaw stems from improper privilege management (CWE-269) in how the service handles operations, yielding full confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have low-privileged authenticated local code execution on the target (CVSS PR:L, AV:L) - this is a second-stage privilege escalation, not a remote entry point. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (High) reflects a local, low-complexity attack requiring only low privileges and no user interaction, with high impact to all three security properties - the canonical profile of a SYSTEM-level LPE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a foothold as a low-privileged local user - for example via a phishing payload or a compromised service account - invokes the vulnerable Microsoft Install Service to abuse its improper privilege handling and obtain SYSTEM-level execution. With low attack complexity and no user interaction required, the escalation is reliable once local code execution exists, giving the attacker full control of the host. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50343 to every affected edition; Microsoft has released a patch (patch available per vendor advisory) and the fixed build numbers for each Windows and Windows Server version are listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50343 - deploy it through Windows Update, WSUS, or your patch-management tooling, prioritizing multi-user, shared, and domain-controller hosts where local users are least trusted. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server 2019-2025 systems, prioritizing those with critical functions or sensitive data access. …
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
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External POC / Exploit Code
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