EUVD-2026-44313
GHSA-v22r-f7j7-wr95
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local authenticated user (AV:L, PR:L) triggers a low-complexity use-after-free for full host compromise, matching the vendor's EoP profile with high C/I/A.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Use after free in Desktop Window Manager allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows 11 (version 26H1) Desktop Window Manager (DWM) allows an authenticated low-privileged user to gain SYSTEM-level control by exploiting a use-after-free (CWE-416) memory-corruption flaw. Reported by Microsoft and carrying a CVSS 3.1 score of 7.8, the flaw grants full confidentiality, integrity, and availability impact once triggered locally. …
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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 access to a Windows 11 version 26H1 host with the ability to run code as at least a low-privileged/standard user (CVSS PR:L, AV:L, UI:N), from which the vulnerable Desktop Window Manager code path is invoked to trigger the use-after-free. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H describes a locally exploitable (AV:L), low-complexity (AC:L) flaw requiring some existing privileges (PR:L) and no user interaction, yielding total impact on the host - a classic elevation-of-privilege profile scoring 7.8 (High). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already obtained low-privileged code execution on a Windows 11 26H1 machine - for example via phishing malware or a compromised standard user account - invokes the vulnerable Desktop Window Manager code path to trigger the use-after-free, grooms the heap to control the freed object, and elevates to SYSTEM. No user interaction is required and attack complexity is low, though a working, reliable exploit is not publicly identified at time of analysis. |
| Remediation | Apply the Microsoft-released security update for CVE-2026-58634; a patch is available from the vendor (Patch available per vendor advisory) and the exact fixed build should be taken from the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58634 and deployed through Windows Update / WSUS / your patch-management tooling. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 11 version 26H1 systems in production, focusing on endpoints with exposed user-facing applications or multi-user access. …
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External POC / Exploit Code
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