EUVD-2026-56385
GHSA-3wcp-53mw-3rwq
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Network-reachable authentication service exploitable by any low-privileged authenticated user; full SYSTEM-level code execution yields high C/I/A with no scope change to other systems.
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
3DescriptionCVE.org
Heap-based buffer overflow in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to execute code over a network.
AnalysisAI
Remote code execution in Microsoft's Local Security Authority Server (lsasrv) affects virtually every supported Windows client and server release, from Windows Server 2012 through Server 2025 and Windows 10 through Windows 11 26H1. The heap-based buffer overflow (CWE-122) is reachable over the network by any low-privileged authenticated attacker - aligning with the CVSS PR:L designation and the description's 'authorized attacker' language - enabling full system compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to hold valid, low-privileged Windows credentials (domain user or local account with network logon rights) - confirmed by CVSS PR:L and the description's phrase 'authorized attacker.' The vulnerable code path is reachable over the network without user interaction (UI:N, AV:N), meaning no victim needs to open a file or click a link. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.8 score with AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H represents a realistic, high-priority threat: network exploitable, low complexity, requiring only low-privileged credentials - a bar any domain user clears. … 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 Microsoft's security update immediately through Windows Update, WSUS, or Microsoft Update Catalog, targeting the patched build thresholds identified in EUVD-2026-56385: Windows Server 2025 to build 10.0.26100.33296 or later, Windows Server 2022 to 10.0.20348.5499 or later, Windows Server 2019 to 10.0.17763.9115 or later, Windows Server 2016 to 10.0.14393.9418 or later, Windows Server 2012 R2 to 6.3.9600.23337 or later, Windows Server 2012 to 6.2.9200.26279 or later, Windows 10 22H2 to 10.0.19045.7663 or later, and Windows 11 24H2 to 10.0.26100.9168 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all Windows Server 2012-2025 and Windows 10-11 systems across the organization; initiate patch deployment planning and communicate prioritization to infrastructure teams. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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