EUVD-2026-56359
GHSA-65j3-3m25-6wr3
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local access with an existing low-privileged account required; AC:H reflects heap-grooming or race condition; full C/I/A captures SYSTEM-level post-exploitation access within the same security scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Use after free in Windows Telephony Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Telephony Service (TAPI) allows an already-authenticated, low-privileged attacker to gain full system-level control via a use-after-free memory corruption flaw. The vulnerability spans a wide range of Windows versions from Server 2012 through Windows 11 26H1 and Server 2025. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated local session on the target Windows host - the CVSS vector PR:L confirms a low-privileged user account is sufficient, and the description explicitly states 'authorized attacker,' meaning anonymous or unauthenticated remote exploitation is not possible. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.0 (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) accurately reflects a meaningful but non-trivial local escalation primitive. … 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 | Microsoft has released patches for all affected Windows versions as listed in the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62723. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows systems with Telephony Service (TAPI) enabled using asset management tools and configuration scans to identify organizational exposure. …
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Same weakness CWE-416 – Use After Free
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External POC / Exploit Code
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