EUVD-2026-44074
GHSA-rvgx-9f8h-xpr7
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable WSUS function with low complexity and no UI; PR:L reflects the required low-privilege foothold, and missing auth on a critical role yields full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
Missing authentication for critical function in Windows Server Update Service allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege elevation in Microsoft's Windows Server Update Services (WSUS) role allows a network-based, low-privileged attacker to gain higher privileges due to a missing authentication check on a critical function (CWE-306). The flaw affects WSUS as shipped on Windows Server 2012 through 2025 (and client builds Windows 10 1607/1809), with a CVSS 3.1 base score of 8.8; Microsoft has released a patch. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to have the WSUS server role installed and network-reachable (default TCP 8530/8531), and per the CVSS vector PR:L the attacker must already hold low-level privileges - a valid low-privilege authenticated context or existing network foothold - rather than being fully anonymous. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (8.8, High) describes a network-reachable, low-complexity attack that requires some existing low-level privilege (PR:L), no user interaction, and yields full confidentiality, integrity, and availability impact within the same scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who already holds a low-privilege foothold on the network - for example a standard authenticated account or a compromised low-tier host - sends crafted requests to a reachable WSUS server and invokes a privileged function that lacks an authentication/authorization check, thereby elevating their privileges on the WSUS infrastructure. Given the low attack complexity and network vector, this requires no user interaction; no public POC is currently identified, but successful abuse of update infrastructure could enable downstream tampering with patch distribution. |
| Remediation | Apply the Microsoft security update for CVE-2026-50444 to every affected system running the WSUS role; a patch is available per the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50444, where the exact fixed build for each OS (Server 2012 through 2025, plus Windows 10 1607/1809) is listed - install the KB matching your specific OS version and cumulative-update baseline. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all WSUS servers in your environment and the Windows Server versions (2012-2025) and Windows 10 versions (1607, 1809) they serve; document network exposure and access controls. …
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External POC / Exploit Code
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