EUVD-2026-43858
GHSA-rc38-f4j6-jq4f
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable SMB (AV:N) with low complexity (AC:L) exploitable by an authenticated low-privileged user (PR:L) and no interaction, yielding full host compromise (C/I/A:H).
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
Incorrect implementation of authentication algorithm in Windows SMB Server allows an authorized attacker to elevate privileges over a network.
AnalysisAI
Privilege escalation in Microsoft Windows SMB Server allows an already-authenticated network attacker to elevate to higher privileges by abusing a flawed authentication algorithm, yielding high confidentiality, integrity, and availability impact. The flaw affects Windows 10 (21H2/22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2022/2025 including Server Core. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to already hold valid low-level credentials on the network (CVSS PR:L, so authenticated), network reachability to the target's SMB Server on TCP 445, and no user interaction (UI:N) or high complexity (AC:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score is 8.8 (High) with vector AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating a network-reachable, low-complexity attack that requires only low privileges (an authenticated but unprivileged foothold) and no user interaction, producing full high impact to confidentiality, integrity, and availability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has obtained a low-privileged authenticated session (for example a standard domain user account or a compromised service credential) sends crafted SMB authentication traffic to a vulnerable Windows host over the network. Exploiting the incorrect authentication-algorithm implementation, the attacker escalates to higher privileges on the target with full read/write and availability impact. … |
| Remediation | Apply the Microsoft security update for CVE-2026-50360 as delivered through Windows Update / WSUS for each affected SKU; Patch available per vendor advisory (see https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50360 for the exact patched build per product), as no single fix version string is provided in the input. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Windows 10 (21H2/22H2), Windows 11 (24H2/25H2/26H1), Windows Server 2022, and Windows Server 2025 systems to determine patch scope and prioritization strategy. …
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External POC / Exploit Code
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