EUVD-2026-44077
GHSA-2926-79wg-c74j
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 to reach SYSTEM, giving full C/I/A impact with no scope change.
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 Microsoft Brokering File System allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Brokering File System affects Windows 11 24H2/25H2/26H1 and Windows Server 2025, where a use-after-free (CWE-416) lets an already-authenticated local user corrupt memory to elevate to higher privileges (typically SYSTEM). Microsoft has released a patch and rates it 7.8 (High). …
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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 with the ability to run code as at least a standard/low-privileged user on the target (CVSS PR:L, AV:L); it cannot be triggered remotely or by a fully unauthenticated actor. … 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, 7.8) describes a low-complexity local attack requiring only low existing privileges and no user interaction, yielding full confidentiality, integrity and availability impact - the classic profile of an elevation-of-privilege primitive escalating a standard user to 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 11 24H2 host - for example via a phishing payload or a compromised standard user account - runs a crafted program that drives the Brokering File System into a use-after-free, grooms the freed allocation, and hijacks the stale reference to execute code as SYSTEM. From there they disable defenses, install persistence, and move laterally. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50458 - patch available per vendor advisory (Microsoft-reported) at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50458; deploy the corresponding cumulative update / KB for your specific build (Windows 11 24H2, 25H2, 26H1, Windows Server 2025 including Server Core) via Windows Update, WSUS, or Intune as the primary and definitive fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a comprehensive inventory of all Windows 11 (24H2, 25H2, 26H1) and Windows Server 2025 systems in production, prioritizing servers running critical applications or hosting multiple user accounts. …
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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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