EUVD-2026-43868
GHSA-4wcj-v4hp-ch6p
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation requiring existing low-privileged access (AV:L, PR:L), no user interaction, low complexity, yielding full SYSTEM-level confidentiality, integrity, and availability 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 Unified Consent System allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Unified Consent System (UCS) lets an already-authenticated attacker exploit a use-after-free memory-corruption flaw (CWE-416) to gain higher privileges, potentially up to SYSTEM. It affects a broad range of current Windows client and server builds including Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, and Windows Server 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, authenticated low-privileged access to the target Windows system and the ability to execute code that interacts with the Unified Consent System component (PR:L, AV: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, score 7.8) describes a local, low-complexity, low-privilege, no-user-interaction elevation of privilege with high confidentiality, integrity, and availability impact on the affected system - a classic post-compromise privilege escalation primitive rather than an initial-access remote vector. … 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 via phishing malware, a compromised service account, or a foothold on a shared RDP server - invokes the Unified Consent System and races its object lifecycle to trigger the use-after-free, reclaiming the freed memory with controlled data. Successful exploitation elevates their privileges (potentially to SYSTEM), enabling disabling of security controls, credential theft, and persistence. … |
| Remediation | Patch available per vendor advisory: apply the Microsoft security update for CVE-2026-50326 from the Security Update Guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50326, selecting the KB/build that matches each affected edition (Windows 10 21H2/22H2, Windows 11 24H2/25H2/26H1, Windows Server 2025 and Server Core). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and catalog all Windows 10 (21H2, 22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server 2025 systems in your environment using SCCM, Intune, or equivalent asset management tools. …
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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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