EUVD-2026-56448
GHSA-cv8q-w3rf-c5cc
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only attack via AV:L; PR:L confirmed since standard user account suffices; S:U as overflow remains within the OS trust boundary.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows Storage Port Driver allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Storage Port Driver (storport.sys) exploits a heap-based buffer overflow to allow an authorized low-privilege user to gain SYSTEM-level control of an affected Windows host. The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N) confirms the attack requires only an existing low-privilege local session - no additional permissions or user interaction are needed - with full confidentiality, integrity, and availability impact upon success. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold an active local session on the target Windows machine running under a low-privilege standard user account, as confirmed by CVSS vector AV:L/PR:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 rating reflects a high-severity but locally-scoped flaw: AV:L means no remote or network-based exploitation is possible, while PR:L confirms that a standard unprivileged user account is sufficient to trigger the vulnerability - no administrator credentials are required. … 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 security update for CVE-2026-65814 via Windows Update, Windows Server Update Services (WSUS), or the Microsoft Update Catalog; the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65814 is the authoritative source for the specific KB article and patched build number, which are not independently confirmed from available input data. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all affected Windows systems running vulnerable versions of storport.sys using endpoint detection tools or asset management systems, and enable enhanced monitoring for privilege escalation attempts targeting the driver. …
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External POC / Exploit Code
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