EUVD-2026-44104
GHSA-p83h-w63g-r43h
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only authenticated EoP (AV:L, PR:L); use-after-free race gives AC:H; successful SYSTEM elevation yields full C:H/I:H/A:H with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Use after free in Windows Installer allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Installer (msiexec) service across Windows 10, Windows 11, and Windows Server 2012 through 2025 allows an already-authenticated local user to gain higher privileges by triggering a use-after-free memory-corruption condition. No public exploit has been identified at time of analysis, and it is not listed in CISA KEV, but Microsoft has published a patch. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have authenticated local access with low privileges (CVSS PR:L, AV:L) - this is a local elevation-of-privilege chain, not remote. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderate and internally consistent: the CVSS 3.1 vector (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H, base 7.0/High) describes a local-only attack requiring existing low privileges and high attack complexity, but yielding full high impact to confidentiality, integrity, and availability once successful. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained a low-privileged local account (for example via phishing, a stolen credential, or a compromised service) invokes or manipulates a Windows Installer operation and races the installer to reuse a freed memory object, corrupting privileged state to execute code or actions as SYSTEM. Because AC:H reflects a timing/heap race, the attacker may need multiple attempts, and no public POC is currently identified. |
| Remediation | Apply the Microsoft-released security update for CVE-2026-50490 (Patch available per vendor advisory) via Windows Update or WSUS/SCCM for each affected SKU; the exact patched build for your specific Windows 10/11 or Server version is listed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50490. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of Windows 10, Windows 11, and Windows Server 2012-2025 systems in your environment, prioritizing critical infrastructure and systems with sensitive data access. …
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External POC / Exploit Code
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