EUVD-2026-44312
GHSA-fq9x-x87x-q852
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation from an authenticated low-priv user (AV:L, PR:L) via a reliable use-after-free (AC:L) yielding SYSTEM-level full C/I/A impact.
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 Desktop Window Manager allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Desktop Window Manager (DWM) component of Windows 11 version 26H1 allows an authenticated local attacker to elevate to SYSTEM by triggering a use-after-free memory corruption condition. The CVSS 3.1 vector (AV:L/PR:L) confirms an already-authenticated low-privileged user is required, and full compromise of confidentiality, integrity, and availability follows successful exploitation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have a low-privileged authenticated local session on the target (CVSS PR:L, AV:L) running Windows 11 version 26H1 - it cannot be triggered remotely or by an unauthenticated user. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals are moderately concerning but not emergency-level. … 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 11 26H1 machine - for example via phishing-delivered malware or stolen standard-user credentials - runs a crafted program that manipulates DWM graphics objects to trigger the use-after-free, grooms the heap to reoccupy the freed memory, and hijacks the dangling pointer to execute code in the privileged DWM context, achieving SYSTEM-level control. No user interaction is required and attack complexity is low, so exploitation would be reliable once working code is developed, though no public exploit currently exists. |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-58633 published in the MSRC update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58633, which supplies the fixed cumulative update for Windows 11 version 26H1 (consult the advisory for the exact KB and build number, which are not reproduced in the input data). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 11 version 26H1 systems in your environment using asset management tools and establish baseline for impact scope. …
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External POC / Exploit Code
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