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CVE-2026-85831 Microsoft CVE debrief

The Windows Biometric Service Information Disclosure Vulnerability (CVE-2026-85831) is a heap-based buffer overflow vulnerability that allows an authorized attacker to disclose information locally. This vulnerability affects Windows Biometric Service deployments, particularly those using affected versions. Defenders responsible for these deployments should assess exposure and apply patches from Microsoft. The CVE record was published on 2026-10-13T19:00:07.863Z and has not been modified since then. The NVD entry is currently unclassified. This vulnerability requires verification of exposure and patching to prevent information disclosure in Windows Biometric Service deployments.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows Biometric Service deployments, particularly those using affected versions, should assess exposure and apply patches.

Why it matters

CVE-2026-85831 requires verification of exposure and patching to prevent information disclosure in Windows Biometric Service deployments.

  • Verify exposure in Windows Biometric Service deployments
  • Apply patches from Microsoft to prevent information disclosure
  • Monitor for local information disclosure attempts

Technical summary

The Windows Biometric Service has a heap-based buffer overflow vulnerability, allowing an authorized attacker to disclose information locally. This vulnerability is caused by a buffer overflow in the Windows Biometric Service, which can be exploited by an authorized attacker to disclose sensitive information. The vulnerability affects Windows Biometric Service deployments, particularly those using affected versions. Defenders should prioritize verifying exposure in Windows Biometric Service deployments and applying patches from Microsoft.

Defensive priority

Defenders should prioritize verifying exposure in Windows Biometric Service deployments and applying patches from Microsoft.

Recommended defensive actions

  • Verify exposure in Windows Biometric Service deployments
  • Apply patches from Microsoft
  • Monitor for local information disclosure attempts

Evidence notes

The CVE record and source item provide details on the Windows Biometric Service Information Disclosure Vulnerability, including affected versions and a reference to a Microsoft advisory.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85831 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85831

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

  • CVE-2026-85831 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85831

    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.