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CVE-2026-69799 Microsoft CVE debrief

A race condition vulnerability in Windows Hello allows an authorized attacker to elevate privileges locally. Multiple Windows versions are affected, including Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, and Windows 11 version 26H1. This vulnerability is particularly concerning as it allows for local privilege escalation, which can have significant operational impacts. Defenders should prioritize patching affected systems and verify configurations to prevent exploitation. The CVE record and source item provide details on the vulnerability, including its description and affected

Vendor
Microsoft
Product
Windows 10 Version 21H2
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-10-08
Advisory published
2026-09-08
Advisory updated
2026-10-08

Who should care

Defenders responsible for Windows systems, particularly those using Windows Hello for authentication, should be aware of this vulnerability and prioritize patching.

Why it matters

CVE-2026-69799 is a high-severity vulnerability in Windows Hello that allows for local privilege escalation. Defenders should prioritize patching affected systems and verify configurations to prevent exploitation.

  • Local privilege escalation is possible
  • Patching is required to prevent exploitation
  • Verify system configurations to ensure no exposure

Technical summary

A race condition vulnerability in Windows Hello allows an authorized attacker to elevate privileges locally. The vulnerability affects multiple Windows versions, including Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, and Windows 11 version 26H1.

Defensive priority

Defenders should prioritize patching this vulnerability, as it allows for local privilege escalation.

Recommended defensive actions

  • Patch affected Windows versions
  • Verify system configurations
  • Monitor for suspicious activity

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. The vulnerability affects multiple Windows versions, including Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, and Windows 11 version 26H1. Defenders should verify configurations to ensure no exposure and prioritize patching. The source-confidence limits of this CVE are

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69799 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69799

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

  • CVE-2026-69799 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69799

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

Supplemental references

  • Windows Hello Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/69xxx/CVE-2026-69799.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69799

    Supplemental source - vendor-advisory, patch

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.