CVE-2026-96219

Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability

publishedCWE-787

Out-of-bounds write in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to execute code over a network.

Technical severity9.8 criticalCVSS 3.1 · CNA: microsoft

Published2026-10-13Source updated 2026-11-03

Collected2026-11-043 attributed sources

Fixes and workarounds

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: CNA: microsoft

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
Windows 10 Version 1809 Microsoft Platforms: 32-bit Systems, x64-based Systems	≥ 10.0.17763.0; < 10.0.17763.9376 (affected, custom)	CNA: microsoft
Windows 10 Version 21H2 Microsoft Platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems	≥ 10.0.19044.0; < 10.0.19044.7807 (affected, custom)	CNA: microsoft
Windows 10 Version 22H2 Microsoft Platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems	≥ 10.0.19045.0; < 10.0.19045.7807 (affected, custom)	CNA: microsoft
Windows 11 version 23H2 Microsoft Platforms: ARM64-based Systems	≥ 10.0.22631.0; < 10.0.22631.7652 (affected, custom)	CNA: microsoft
Windows 11 Version 23H2 Microsoft Platforms: x64-based Systems	≥ 10.0.22631.0; < 10.0.22631.7652 (affected, custom)	CNA: microsoft
Windows 11 Version 24H2 Microsoft Platforms: ARM64-based Systems, x64-based Systems	≥ 10.0.26100.0; < 10.0.26100.9711 (affected, custom)	CNA: microsoft
Windows 11 Version 25H2 Microsoft Platforms: ARM64-based Systems, x64-based Systems	≥ 10.0.26200.0; < 10.0.26200.9711 (affected, custom)	CNA: microsoft
Windows 11 version 26H1 Microsoft Platforms: ARM64-based Systems, x64-based Systems	≥ 10.0.28000.0; < 10.0.28000.3231 (affected, custom)	CNA: microsoft
Windows 11 Version 26H2 Microsoft Platforms: ARM64-based Systems, x64-based Systems	≥ 10.0.26300.0; < 10.0.26300.9711 (affected, custom)	CNA: microsoft
Windows Server 2019 Microsoft Platforms: x64-based Systems	≥ 10.0.17763.0; < 10.0.17763.9376 (affected, custom)	CNA: microsoft
Windows Server 2019 (Server Core installation) Microsoft Platforms: x64-based Systems	≥ 10.0.17763.0; < 10.0.17763.9376 (affected, custom)	CNA: microsoft
Windows Server 2022 Microsoft Platforms: x64-based Systems	≥ 10.0.20348.0; < 10.0.20348.5761 (affected, custom)	CNA: microsoft
Windows Server 2025 Microsoft Platforms: x64-based Systems	≥ 10.0.26100.0; < 10.0.26100.33650 (affected, custom)	CNA: microsoft
Windows Server 2025 (Server Core installation) Microsoft Platforms: x64-based Systems	≥ 10.0.26100.0; < 10.0.26100.33650 (affected, custom)	CNA: microsoft

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.17763.9376",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
            "versionEndExcluding": "10.0.17763.9376",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*",
            "versionEndExcluding": "10.0.19044.7807",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.19044.7807",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*",
            "versionEndExcluding": "10.0.19044.7807",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*",
            "versionEndExcluding": "10.0.19045.7807",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.19045.7807",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*",
            "versionEndExcluding": "10.0.19045.7807",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*",
            "versionEndExcluding": "10.0.22631.7652",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.22631.7652",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*",
            "versionEndExcluding": "10.0.26100.9711",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.26100.9711",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*",
            "versionEndExcluding": "10.0.26200.9711",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.26200.9711",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*",
            "versionEndExcluding": "10.0.28000.3231",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.28000.3231",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:arm64:*",
            "versionEndExcluding": "10.0.26300.9711",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.26300.9711",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "10.0.17763.9376",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.20348.5761",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*",
            "versionEndExcluding": "10.0.26100.33650",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 9.8 critical	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`	CNA: microsoft
3.1 / 9.8 critical	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`	NVD: [email protected]

Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96219CNA: microsoft · vendor-advisory, patch
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96219[email protected] · Vendor Advisory

For agents and automation

Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.

Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.

Get an API key Use x402 Connect an agent

Endpoints and access details

https://api.y2.dev/api/v2/cyber/cves
https://api.y2.dev/api/v2/cyber/cves/{cveId}

A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.

For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.

Agent access JSON · OpenAPI · CVE API guide