EUVD-2026-43841
GHSA-85p7-8497-7788
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local, authenticated low-priv attacker (AV:L/PR:L) exploiting a timing-dependent race (AC:H) with no user interaction to gain privileges yielding full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Clip Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Clip Service (clipboard/cloud clipboard component, cbdhsvc) affects a broad range of Windows 10, Windows 11, and Windows Server 2019-2025 builds, where a race condition in concurrent access to a shared resource lets an already-authenticated local attacker win a timing window to gain higher privileges. Reported by Microsoft with a patch available; there is no public exploit identified at time of analysis and it is not listed in CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already have valid low-privileged local access to the target (PR:L, AV:L) and the ability to run code that interacts with the Windows Clip Service (cbdhsvc); no user interaction is needed (UI:N). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 7.0 (High) with vector AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - local vector, high attack complexity, low privileges required, no user interaction, unchanged scope, and high impact across confidentiality, integrity, and availability. … 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, a compromised user account, or a malicious insider - runs a tool that repeatedly races operations against the Clip Service to hit the unsynchronized window. On a successful race, the attacker manipulates the shared resource to have privileged code act on attacker-controlled state, elevating from a standard user to higher privileges and gaining full control impact. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50384; a patch is available from the vendor and the exact patched build numbers for each affected OS are listed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50384 (the input does not provide a single fix version, so consult the advisory for the KB/build matching your specific Windows release). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a comprehensive inventory of all Windows 10, Windows 11, and Windows Server 2019-2025 systems across your environment to establish the scope for patching. …
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External POC / Exploit Code
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