Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local privilege escalation from an existing low-privileged session (AV:L, PR:L) with no user interaction; a successful use-after-free yields SYSTEM-level control, so C/I/A all High.
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 Clipboard Server allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Clipboard Server (Cliprdr/RDP clipboard virtual channel service) affects a broad range of Windows 10, Windows 11, and Windows Server builds (from 1809 through 11 26H1 and Server 2025). An authenticated local attacker who can trigger a use-after-free (CWE-416) in the service can corrupt memory to run code at elevated (SYSTEM-level) privilege. …
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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 code-execution ability on the target (CVSS PR:L, AV:L) - this is a privilege-escalation bug, not a remote entry point, so a valid low-privilege session is the mandatory precondition. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H yields 7.8 (High): exploitation is local (AV:L), low-complexity (AC:L), requires only low existing privileges (PR:L), needs no user interaction (UI:N), and fully compromises confidentiality, integrity, and availability of the host. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privileged foothold on a Windows host - for example a standard domain user, a compromised service account, or a user connected to a Remote Desktop session - runs a crafted local program that drives the Clipboard Server through a sequence of clipboard operations to free and then reclaim an internal object, corrupting memory to execute code as SYSTEM. No user interaction and no elevated rights are needed to start, making it an ideal post-compromise privilege-escalation step. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50689 (Patch available per vendor advisory) - install the relevant monthly cumulative update for each affected SKU as listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50689; exact fixed build numbers per Windows version are provided there. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10, 11, and Windows Server systems to identify which are running affected builds (1809 through 11 26H1 and Server 2025). …
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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
Leaving vuln.today
EUVD-2026-44145
GHSA-w9qp-349f-p25g