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CVE-2026-78448 Microsoft CVE debrief

A heap-based buffer overflow vulnerability exists in the Windows Biometric Service, allowing an authorized attacker to elevate privileges locally. This CVE was published on 2026-09-08T18:20:42.800Z and was last modified on 2026-09-12T04:16:37.980Z. The vulnerability is a high-severity issue that defenders should prioritize patching, especially for systems with exposed biometric services. Affected versions include Windows 10, Windows 11, and Windows Server versions. The CVSS score is 7.8 with a HIGH severity. Defenders responsible for Windows systems, especially those with biometric services exposed, should assess their exposure and prioritize patching. The vulnerability allows an

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-12
Advisory published
2026-09-08
Advisory updated
2026-09-12

Who should care

Defenders responsible for Windows systems, especially those with biometric services exposed, should assess their exposure and prioritize patching.

Why it matters

CVE-2026-78448 is a high-severity vulnerability in Windows Biometric Service that allows local privilege elevation. Defenders should prioritize patching and verify inventory of affected systems.

  • Local privilege elevation could lead to unauthorized access to sensitive data.
  • Successful exploitation requires local access and authorization.
  • Patching is required to prevent exploitation.
  • Verify inventory and monitor for suspicious activity.

Technical summary

The vulnerability exists in the Windows Biometric Service and allows an authorized attacker to elevate privileges locally through a heap-based buffer overflow. Affected versions include Windows 10, Windows 11, and Windows Server versions. The vulnerability is described as a heap-based buffer overflow in the Windows Biometric Service, which could allow an authorized attacker to elevate privileges locally. The CVSS score is 7.8 with a HIGH severity. Defenders should prioritize patching this vulnerability, especially for systems with exposed biometric services. The

Defensive priority

Defenders should prioritize patching this vulnerability, especially for systems with exposed biometric services.

Recommended defensive actions

  • Apply patches from Microsoft for the affected Windows versions.
  • Review and update inventory of Windows systems with biometric services exposed.
  • Verify local privilege elevation controls and monitor for suspicious activity.

Evidence notes

The vulnerability is described as a heap-based buffer overflow in the Windows Biometric Service, which could allow an authorized attacker to elevate privileges locally. The CVSS score is 7.8 with a HIGH severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78448 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78448

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

  • CVE-2026-78448 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78448

    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.