EUVD-2026-44115
GHSA-4jqm-4jm7-mqg5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector and low complexity with an existing low-privileged account (AV:L/AC:L/PR:L), no interaction, yielding SYSTEM-level full C/I/A impact in an unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Deserialization of untrusted data in Windows Wireless Wide Area Network Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Wireless Wide Area Network Service (WwanSvc) lets an authenticated low-privileged user elevate to SYSTEM by delivering crafted serialized data that the service deserializes unsafely (CWE-502). Reported by Microsoft, it affects a broad range of Windows 10, Windows 11, and Windows Server builds and carries CVSS 7.8 with high confidentiality, integrity, and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already be an authenticated, low-privileged local user on the target (CVSS PR:L, AV:L) and to be able to reach and submit serialized input to the Windows Wireless Wide Area Network Service (WwanSvc); the specific IPC/interface used to hand untrusted serialized data to the service is the exact prerequisite, since the flaw is deserialization of that input. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, 7.8 High) describes a locally-exploitable, low-complexity flaw requiring an existing low-privilege authenticated account and no user interaction, yielding full high impact on confidentiality, integrity, and availability within an unchanged scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privileged foothold on a Windows host - for example a standard user or a compromised low-privilege service account - crafts malicious serialized data and delivers it to the local Wireless WAN Service, whose unsafe deserialization executes attacker-controlled logic in the privileged service context to gain SYSTEM. Because the vector is AV:L/AC:L/PR:L/UI:N, exploitation is local, low-complexity, and requires no victim interaction. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50509 for your specific Windows build; a vendor patch is available and the authoritative per-product fixed versions are listed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50509 (Patch available per vendor advisory). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 24 hours, identify and inventory all Windows 10, Windows 11, and Windows Server systems across your environment and assess patch applicability. …
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Same weakness CWE-502 – Deserialization of Untrusted Data
View allSame technique Deserialization
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External POC / Exploit Code
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