EUVD-2026-44097
GHSA-qhx9-cjw7-mfcq
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local use-after-free EoP triggerable by an authenticated low-privileged user without interaction (AV:L, PR:L, UI:N), granting full SYSTEM-level control (C/I/A:H) within 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
Use after free in Windows Runtime allows an authorized attacker to elevate privileges locally.
AnalysisAI
Elevation of privilege in the Windows Runtime (WinRT) component affects Windows 10 (21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2025, where a use-after-free memory-corruption flaw lets an already-authenticated local user run code at higher privilege. Microsoft has released a patch and reported the issue; there is no public exploit identified at time of analysis and the CVE is not listed in CISA KEV. …
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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 as a low-privileged user on the target host (CVSS PR:L, AV:L), from which they invoke the vulnerable Windows Runtime code path to trigger the use-after-free; no user interaction is required (UI:N) and attack complexity is low (AC:L). … 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 local, low-complexity attack requiring low privileges and no user interaction, yielding high confidentiality, integrity, and availability impact within an unchanged scope - a classic local EoP profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already has a foothold as a standard (low-privilege) user on a Windows 11 or Server 2025 host - for example via phishing-delivered malware or a compromised service account - invokes the vulnerable Windows Runtime component to trigger the use-after-free, grooming the heap to control the freed object. Successful exploitation elevates the process to SYSTEM-level privileges, enabling full host compromise. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-50486 referenced at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50486, selecting the cumulative update matching each affected build (Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 2025 including Server Core); exact fixed build numbers are listed in the MSRC update guide entry. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Server 2025 systems to identify scope and create a patch deployment plan prioritized by system criticality. …
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External POC / Exploit Code
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