EUVD-2026-73778
GHSA-72mw-w2p6-c2gv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Network-reachable, unauthenticated iSCSI weak-auth bypass with no user interaction; adopting vendor's C:H/I:H/A:H since storage access implies full CIA, though impact detail is unverified.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Weak authentication in Windows iSCSI allows an unauthorized attacker to bypass a security feature over a network.
AnalysisAI
Security feature bypass in Microsoft Windows iSCSI (Initiator/Target service) lets a remote, unauthenticated attacker defeat the protocol's weak authentication over the network, per Microsoft's advisory carrying a 9.8 CVSS with full confidentiality, integrity, and availability impact. The flaw spans essentially the entire supported Windows Server line (2012 through 2025) plus Windows 10 (1607/1809), and a vendor patch is available. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target Windows system to be running the iSCSI Initiator or iSCSI Target service and to be reachable on the storage network (iSCSI default TCP port 3260); the CVSS vector (PR:N/UI:N) indicates no authentication or user interaction is needed once the service is exposed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N, C:H/I:H/A:H = 9.8) describes a trivially reachable, unauthenticated network attack with total system impact, which on paper is a top-priority item. … 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 the Microsoft security update for your OS build: patched builds are 6.2.9200.26349 (Server 2012), 6.3.9600.23397 (Server 2012 R2), 10.0.14393.9512 (Server 2016 / Win10 1607), 10.0.17763.9245 (Server 2019 / Win10 1809), 10.0.20348.5622 (Server 2022), and 10.0.26100.33438 (Server 2025) - see https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-73025 for the exact KB per SKU (Vendor-released patch available). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running Windows iSCSI Initiator or Target services, prioritizing Windows Server 2012-2025 and Windows 10 1607/1809; identify systems with iSCSI ports (typically 3260) exposed to untrusted networks. …
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Same weakness CWE-1390 – Weak Authentication
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today