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Windows Network Connection Broker EUVDEUVD-2026-73416

| CVE-2026-68886 MEDIUM
Error Message Information Leak (CWE-209)
2026-09-08 secure@microsoft.com GHSA-m28r-p569-2279
5.5
CVSS 3.1 · Vendor: microsoft
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Severity by source

Vendor (microsoft) PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
5.5 MEDIUM

Local-only UAF requiring a valid low-privileged user session; impact is memory disclosure only with no integrity or availability effect.

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

Primary rating from Vendor (microsoft).

CVSS VectorVendor: microsoft

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

Lifecycle Timeline

4
Metadata Corrected
Sep 09, 2026 - 01:40 vuln.today
tag: Denial Of Service removed
Analysis Generated
Sep 09, 2026 - 01:29 vuln.today
Patch available
Sep 08, 2026 - 18:35 EUVD
CVE Published
Sep 08, 2026 - 18:18 cve.org
MEDIUM 5.5

DescriptionCVE.org

Use after free in Windows Network Connection Broker allows an authorized attacker to disclose information locally.

AnalysisAI

Use-after-free in the Windows Network Connection Broker service allows a local authenticated attacker to read stale heap memory, disclosing potentially sensitive information. The vulnerability spans every supported Windows client and server release from Windows 10 1607 and Windows Server 2016 through Windows 11 25H2 and Windows Server 2025, making the exposed surface extremely broad. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid low-privileged local user account on the target Windows system, consistent with PR:L in the CVSS 3.1 vector. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVE-2026-68886 represents a moderate real-world risk, consistent with its CVSS 5.5 rating. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Apply the Microsoft cumulative updates corresponding to each affected SKU. … Detailed patch versions, workarounds, and compensating controls in full report.

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

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EUVD-2026-73416 vulnerability details – vuln.today

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