# CVE-2026-96219: Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability

Status: published. Published: 2026-10-13. Updated: 2026-11-03.

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

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: microsoft) — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96219

## Affected products and versions

- Microsoft / Windows 10 Version 1809: ≥ 10.0.17763.0; < 10.0.17763.9376 (affected, custom). Source: CNA: microsoft; platforms: 32-bit Systems, x64-based Systems
- Microsoft / Windows 10 Version 21H2: ≥ 10.0.19044.0; < 10.0.19044.7807 (affected, custom). Source: CNA: microsoft; platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems
- Microsoft / Windows 10 Version 22H2: ≥ 10.0.19045.0; < 10.0.19045.7807 (affected, custom). Source: CNA: microsoft; platforms: 32-bit Systems, ARM64-based Systems, x64-based Systems
- Microsoft / Windows 11 version 23H2: ≥ 10.0.22631.0; < 10.0.22631.7652 (affected, custom). Source: CNA: microsoft; platforms: ARM64-based Systems
- Microsoft / Windows 11 Version 23H2: ≥ 10.0.22631.0; < 10.0.22631.7652 (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Windows 11 Version 24H2: ≥ 10.0.26100.0; < 10.0.26100.9711 (affected, custom). Source: CNA: microsoft; platforms: ARM64-based Systems, x64-based Systems
- Microsoft / Windows 11 Version 25H2: ≥ 10.0.26200.0; < 10.0.26200.9711 (affected, custom). Source: CNA: microsoft; platforms: ARM64-based Systems, x64-based Systems
- Microsoft / Windows 11 version 26H1: ≥ 10.0.28000.0; < 10.0.28000.3231 (affected, custom). Source: CNA: microsoft; platforms: ARM64-based Systems, x64-based Systems
- Microsoft / Windows 11 Version 26H2: ≥ 10.0.26300.0; < 10.0.26300.9711 (affected, custom). Source: CNA: microsoft; platforms: ARM64-based Systems, x64-based Systems
- Microsoft / Windows Server 2019: ≥ 10.0.17763.0; < 10.0.17763.9376 (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Windows Server 2019 (Server Core installation): ≥ 10.0.17763.0; < 10.0.17763.9376 (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Windows Server 2022: ≥ 10.0.20348.0; < 10.0.20348.5761 (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Windows Server 2025: ≥ 10.0.26100.0; < 10.0.26100.33650 (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems
- Microsoft / Windows Server 2025 (Server Core installation): ≥ 10.0.26100.0; < 10.0.26100.33650 (affected, custom). Source: CNA: microsoft; platforms: x64-based Systems

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "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"
  }
]
```

## Severity and prioritization

- CVSS 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; source: CNA: microsoft

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: secure@microsoft.com

- CISA KEV: No listing in collected sources

- EPSS: 0.89% as of 2026-11-03; percentile 59.47%

- SSVC: exploitation none; automatable yes; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

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

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96219 (CNA: microsoft; vendor-advisory, patch)

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96219 (secure@microsoft.com; Vendor Advisory)

## Provenance

- CNA: microsoft: https://www.cve.org/CVERecord?id=CVE-2026-96219; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-96219; retrieved 2026-11-04; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-96219; retrieved 2026-11-03; source updated Not reported

Revision: 016d549032a3c5098d2cef1355687ef898b6446a593083059b6689610a1bd619

Canonical: https://y2.dev/cve/CVE-2026-96219

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