Description
Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability
Published: 2026-04-14
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Information Disclosure
Action: Patch
AI Analysis

Impact

The vulnerability occurs in the Local Security Authority Subsystem Service (LSASS) in Microsoft Windows operating systems. It allows an attacker to read sensitive information stored in LSASS memory, which can include credentials, configuration data, or other confidential details. The flaw is a buffer over‑read, identified as CWE‑126, and results in information disclosure.

Affected Systems

Affected releases include Microsoft Windows 10 versions 1607, 1809, 21H2, and 22H2; Windows 11 versions 23H2, 24H2, 25H2, 26H1, and 22H3; and Windows Server 2016, 2019, 2022, 2025, and the 23H2 edition, including Server Core installations. These editions cover both desktop and server environments across multiple processor architectures.

Risk and Exploitability

The CVSS score of 6.5 indicates moderate severity. No EPSS score is published and the vulnerability is not listed in the CISA KEV catalog, suggesting no documented public exploits exist at present. The description implies that local or privileged user context is required to exploit the flaw; this inference is based on the protected nature of LSASS memory. Therefore, an attacker with local or administrative access could potentially read the disclosed data. Prompt application of the vendor patch is the recommended mitigation.

Generated by OpenCVE AI on April 14, 2026 at 21:21 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the security update for CVE-2026-26155 from Microsoft’s Update Guide.
  • Verify the update installation by checking Windows Update history or running an Update Readiness assessment.
  • If an immediate patch cannot be applied, limit the number of accounts with administrative privileges and enforce strong authentication protocols.
  • Continuously monitor system logs for abnormal LSASS activity or unauthorized access attempts.

Generated by OpenCVE AI on April 14, 2026 at 21:21 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 15 Apr 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 22h3
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2022, 23h2 Edition (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 22h3
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2022, 23h2 Edition (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Tue, 14 Apr 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 14 Apr 2026 17:30:00 +0000

Type Values Removed Values Added
Description Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability
Title Microsoft Local Security Authority Subsystem Service Information Disclosure Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
Weaknesses CWE-126
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_23h2:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows 10 21h2
Microsoft windows 10 22h2
Microsoft windows 11 23h2
Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Microsoft windows Server 23h2
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows 10 21h2 Windows 10 21h2 Windows 10 22h2 Windows 10 22h2 Windows 11 22h3 Windows 11 23h2 Windows 11 23h2 Windows 11 24h2 Windows 11 24h2 Windows 11 25h2 Windows 11 25h2 Windows 11 26h1 Windows 11 26h1 Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2022, 23h2 Edition (server Core Installation) Windows Server 2025 Windows Server 2025 (server Core Installation) Windows Server 23h2
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-04-17T16:11:55.049Z

Reserved: 2026-02-11T16:24:51.135Z

Link: CVE-2026-26155

cve-icon Vulnrichment

Updated: 2026-04-14T19:03:43.891Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-14T18:16:47.277

Modified: 2026-04-17T15:10:35.607

Link: CVE-2026-26155

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-15T21:02:51Z

Weaknesses