EUVD-2026-43788
GHSA-2333-38mw-8777
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
PR:L confirmed by 'authorized attacker' in description; AV:N consistent with Event Log remote interface; C:H and I:N/A:N match pure information disclosure with no modification or disruption impact.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionNVD
Protection mechanism failure in Windows Event Logging Service allows an authorized attacker to disclose information over a network.
AnalysisAI
Windows Event Logging Service across a wide range of Windows 10, Windows 11, and Windows Server versions fails to enforce its intended protection mechanisms, permitting any authenticated low-privileged network user to read information that should be access-controlled. The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N) confirms exploitation requires only a valid low-privilege account and network connectivity, with no user interaction and no elevated rights - making it a practical post-compromise lateral-movement or reconnaissance tool. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The CVSS PR:L metric confirms that a valid low-privileged authenticated account is required - unauthenticated or anonymous exploitation is not supported by the available data. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 6.5 is well-grounded in the vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N): network-reachable, low complexity, low-privilege authenticated, no user interaction, no scope change, confidentiality impact only. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained a low-privileged domain or local account - through credential phishing, password spraying, or lateral movement - connects over the network to a target Windows host and issues requests to the Windows Event Logging Service. Due to the protection mechanism failure, the service returns event log records beyond the caller's authorized scope, potentially exposing Security log entries containing logon activity, process execution details, or cleartext credentials passed via command-line arguments. … |
| Remediation | Apply the vendor-released security update published by Microsoft via Windows Update, WSUS, or Microsoft Update Catalog; consult https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34348 for specific KB article numbers and servicing channel guidance applicable to each affected Windows version. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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