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CVE-2026-69365 Microsoft CVE debrief

Microsoft Local Security Authority Server (lsasrv) Out-of-bounds Read. The vulnerability is an out-of-bounds read in the Microsoft Local Security Authority Server (lsasrv) that allows an authorized attacker to elevate privileges over a network. This issue affects various versions of Windows 10, Windows 11, and Windows Server. System administrators and security teams should assess exposure, verify vulnerable systems, and apply patches or updates to address the vulnerability. The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and affected products. The vulnerability has a high severity with a CVSS score of 8. The debrid

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
HIGH 8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-29
Advisory published
2026-09-08
Advisory updated
2026-09-29

Who should care

System administrators and security teams responsible for managing Windows-based systems, particularly those with network-exposed systems or systems that require privilege elevation.

Why it matters

CVE-2026-69365 is a high-severity vulnerability in Microsoft Local Security Authority Server (lsasrv) that allows authorized attackers to elevate privileges over a network. System administrators and security teams should assess exposure, verify vulnerable systems, and apply patches or updates to address the vulnerability.

  • Potential privilege elevation for authorized attackers
  • Possible disruption of network services or data access
  • Need for patching or updating vulnerable systems
  • Verification of system logs for exploitation attempts

Technical summary

The vulnerability is an out-of-bounds read in the Microsoft Local Security Authority Server (lsasrv) that allows an authorized attacker to elevate privileges over a network. The vulnerability affects various versions of Windows 10, Windows 11, and Windows Server.

Defensive priority

High

Recommended defensive actions

  • Assess exposure of Windows 10, Windows 11, and Windows Server systems to this vulnerability
  • Verify if systems are running vulnerable versions of lsasrv
  • Apply patches or updates provided by Microsoft to address the vulnerability
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, including its description, CVSS score, and affected products. The vulnerability has a high severity with a CVSS score of 8. The NVD entry is currently Analyzed. The CVE record was published on 2026-09-08T18:18:56.573Z and has not been modified since then. The vulnerability affects various versions of Windows 10, Windows 11, and Windows Server. System administrators and security teams should assess exposure,

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69365 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69365

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-69365 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69365

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.