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CVE-2026-77489 Microsoft CVE debrief

A null pointer dereference vulnerability in the Windows Biometric Service allows an authorized attacker to elevate privileges locally. This CVE was published on 2026-09-08T18:20:34.657Z and was last modified on 2026-09-11T20:07:45.743Z. The NVD entry is currently Analyzed. The vulnerability is a null pointer dereference in the Windows Biometric Service, which allows an authorized attacker to elevate privileges locally. The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score of 7.8 and CVSS vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. Defenders should prioritize verifying exposure and applying patches for Windows 10 Version

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
2026-10-14
Advisory published
2026-09-08
Advisory updated
2026-10-14

Who should care

Defenders responsible for Windows 10 Version 1607 and other affected systems should verify exposure and apply patches. This includes reviewing system logs for potential exploitation attempts to detect potential attacks and prioritizing patching based on the CVSS score of 7.8 and CVSS vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Why it matters

CVE-2026-77489 is a null pointer dereference vulnerability in the Windows Biometric Service that allows an authorized attacker to elevate privileges locally. Defenders should verify exposure and apply patches for affected systems.

  • Verify exposure of Windows 10 Version 1607 and other affected systems to prioritize patching
  • Apply patches from Microsoft to prevent local privilege escalation
  • Monitor system logs for potential exploitation attempts to detect potential attacks

Technical summary

The vulnerability is a null pointer dereference in the Windows Biometric Service, which allows an authorized attacker to elevate privileges locally. The CVE record and NVD detail page provide information on the vulnerability, including its CVSS score of 7.8 and CVSS vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Windows 10 Version 1607 and other affected systems.

Recommended defensive actions

  • Verify exposure of Windows 10 Version 1607 and other affected systems
  • Apply patches from Microsoft for affected systems
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability, but do not specify which versions are patched or provide additional details on exploitation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-77489 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-77489

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

  • CVE-2026-77489 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-77489

    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.