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CVE-2026-85851 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-13T19:00:09.064Z and has not been modified since then. The NVD entry is currently unclassified. The Windows SmartScreen Elevation of Privilege Vulnerability is a high-severity issue allowing authorized attackers to elevate privileges locally due to a use-after-free issue. Defenders responsible for Windows 11 and Windows Server 2025 systems should assess exposure and apply patches to mitigate local privilege elevation risks. This vulnerability has a CVSS score of 7.8 and is classified as HIGH severity.

Vendor
Microsoft
Product
Windows 11 version 23H2
CVSS
HIGH 7.8
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 11 and Windows Server 2025 systems should assess exposure and apply patches to mitigate local privilege elevation risks.

Why it matters

CVE-2026-85851 is a high-severity elevation of privilege vulnerability in Windows SmartScreen, allowing authorized attackers to elevate privileges locally. Defenders should prioritize verifying exposure and applying patches for Windows 11 and Windows Server 2025 systems, focusing on local privilege elevation risks.

  • Verify and prioritize patching for Windows 11 and Windows Server 2025 systems to prevent local privilege elevation.
  • Assess and monitor system logs for potential exploitation attempts.
  • Evaluate and implement compensating controls to mitigate potential risks.

Technical summary

The Windows SmartScreen Elevation of Privilege Vulnerability allows an authorized attacker to elevate privileges locally due to a use-after-free issue in Windows SmartScreen. This vulnerability affects Windows 11 and Windows Server 2025 systems. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. Defenders should prioritize verifying exposure and applying patches for affected systems, focusing on local privilege elevation risks.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Windows 11 and Windows Server 2025 systems, focusing on local privilege elevation risks.

Recommended defensive actions

  • Verify and apply patches for affected Windows 11 and Windows Server 2025 systems
  • Assess local privilege elevation risks in Windows 11 and Windows Server 2025 environments
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE record and source item provide details on the Windows SmartScreen Elevation of Privilege Vulnerability, including affected versions and references to vendor advisories.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-85851 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-85851

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

  • CVE-2026-85851 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-85851

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

Supplemental references

  • Windows SmartScreen Elevation of Privilege Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/85xxx/CVE-2026-85851.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85851

    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.