EUVD-2026-44081
GHSA-c2g2-5fg2-7xvg
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local, already-authenticated attacker (AV:L/PR:L); AC:H because success requires winning a timing-sensitive race; full same-scope EoP gives C:H/I:H/A:H.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
5DescriptionNVD
Concurrent execution using shared resource with improper synchronization ('race condition') 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 (WWAN) Service affects all supported Windows 10, Windows 11, and Windows Server builds (2019 through 2025), where a race condition (CWE-362) in access to a shared resource lets an already-authenticated local user win a timing window to gain higher privileges. Microsoft rates it CVSS 7.0 with total technical impact (SSVC), but exploitation requires high attack complexity and there is no public exploit identified at time of analysis. EPSS is low (0.16%, 5th percentile), consistent with the difficulty of reliably winning the race.
Technical ContextAI
The flaw resides in the Windows WWAN Service (wwansvc), the OS component that manages mobile broadband / cellular connectivity for devices with LTE or 5G modems. The root cause is CWE-362, improper synchronization on a shared resource: two concurrent execution paths access the same object without adequate locking, so a carefully timed operation can manipulate state between a check and its use (a check-to-use / TOCTOU-style race). Per the CPE data the same code is present across the entire modern Windows family - client SKUs cpe:2.3:a:microsoft:windows_10_version_1809/21h2/22h2 and windows_11_version_24h2/25h2/26h1, plus server SKUs windows_server_2019/2022/2025 including Server Core installations - indicating a shared platform component rather than an edition-specific bug.
RemediationAI
Vendor-released patch: apply the cumulative update that raises the affected component to at least the fixed build for your SKU - for example 10.0.17763.9020 (1809 / Server 2019), 10.0.19044.7548 (21H2), 10.0.19045.7548 (22H2), 10.0.20348.5386 (Server 2022), 10.0.26100.8875 (24H2), 10.0.26100.33158 (Server 2025), 10.0.26200.8875 (25H2), and 10.0.28000.2269 (26H1) - as listed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50450. As a targeted compensating control until patched, on systems that do not use cellular/mobile-broadband hardware you can set the WWAN AutoConfig service (wwansvc) startup to Disabled, which removes the vulnerable code path; the trade-off is loss of managed LTE/5G connectivity, so do not apply this to laptops or tablets that rely on built-in cellular modems. Standard EoP hygiene (limiting who has interactive local logon rights) also reduces the population of attackers who can reach the local attack surface.
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
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