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Severity by source

Vendor (microsoft) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CIRCL (temporal)
6.8 MEDIUM
cvss
vuln.today AI
7.8 HIGH

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.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 19:38 vuln.today
CVE Published
Jul 14, 2026 - 17:08 nvd
HIGH 7.8

DescriptionCVE.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

Access
Obtain low-privileged local session
Delivery
Invoke Windows Clipboard Server operations
Exploit
Trigger use-after-free on clipboard object
Execution
Reclaim freed memory with controlled data
Impact
Execute code as SYSTEM

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). …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-50689 vulnerability details – vuln.today

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