EUVD-2026-56639
GHSA-r78r-2vvj-j46m
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only TAPI client access with low privilege and high complexity race condition matches the UAF pattern; full C/I/A reflects SYSTEM-level escalation within the unchanged 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 via use-after-free (CWE-416) in the Windows Telephony Service (TAPI) affects every supported Windows desktop and server release, from Windows 10 1607 through Windows 11 26H1 and Windows Server 2012 through 2025. An authorized low-privileged local attacker can trigger improper memory lifecycle management in the privileged tapisrv process, achieving full confidentiality, integrity, and availability impact on the compromised system. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid local logon session on the target Windows host, meaning the attacker must already hold a low-privileged account (PR:L) - remote unauthenticated exploitation is not possible given AV:L. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.0 score (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H) faithfully captures a meaningful but operationally constrained threat. … 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 Microsoft's vendor-released patches through Windows Update, WSUS, or Microsoft Update Catalog, targeting the fixed build versions per platform: Server 2012 to 6.2.9200.26279, Server 2012 R2 to 6.3.9600.23337, Server 2016 and Windows 10 1607 to 10.0.14393.9418, Server 2019 and Windows 10 1809 to 10.0.17763.9115, Server 2022 to 10.0.20348.5499, Windows 10 21H2 to 10.0.19044.7663, Windows 10 22H2 to 10.0.19045.7663, Windows 11 23H2 to 10.0.22631.7517, Windows 11 24H2 and Server 2025 to 10.0.26100.33296 (desktop 24H2 to 10.0.26100.9168), Windows 11 25H2 to 10.0.26200.9168, Windows 11 26H1 to 10.0.28000.2704. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server systems in your environment, prioritizing servers that host critical services or sensitive data. …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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