EUVD-2026-44311
GHSA-mjpw-8r5p-rmgp
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation needing prior low-privileged code execution (AV:L, PR:L), no user interaction, and a use-after-free 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 Windows Win32K allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Win32K kernel-mode subsystem allows an authenticated attacker to elevate to SYSTEM by exploiting a use-after-free (CWE-416) memory-corruption condition. The flaw affects a broad range of supported Windows client and server releases (Windows 10 1607 through Windows 11 26H1, and Windows Server 2016 through 2025). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have local access to the target with low-level privileges (CVSS PR:L) - i.e., the ability to execute code as a standard authenticated user on an affected Windows 10/11 or Windows Server 2016-2025 system; it cannot be triggered remotely over the network (AV:L) and needs no user interaction (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a high-impact but locally-scoped issue: exploitation requires local access and low existing privileges, but no user interaction, and yields full confidentiality, integrity, and availability compromise (SYSTEM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained low-privileged code execution on a Windows host - for example through a phishing payload, a compromised service account, or a low-privilege RDP/terminal session - invokes a crafted sequence of Win32K syscalls to trigger the use-after-free, reclaims the freed kernel object with controlled data, and hijacks execution to elevate to SYSTEM. This local, no-user-interaction, low-complexity path is a classic second-stage escalation used to move from initial foothold to full host compromise. … |
| Remediation | Apply the Microsoft security update for CVE-2026-58632 (Patch available per vendor advisory) via the Microsoft Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58632, which lists the exact patched build/KB for each affected release - this is the primary and recommended fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all Windows 10, Windows 11, and Windows Server 2016-2025 systems in your environment and prioritize patching by system criticality. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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