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Findings

CVE-2026-108463

Windows SmartScreen Security Feature Bypass Vulnerability

Published Oct 13, 2026 · corrected/updated Oct 16, 2026 · Microsoft Windows · evidence confidence high

Affected Microsoft products: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H2 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems.

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-108463 is a high public vulnerability record for Microsoft Windows. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether Microsoft Windows is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: Windows 11 Version 24H2 for ARM64-based Systems; Windows 11 Version 24H2 for x64-based Systems; Windows 11 Version 25H2 for ARM64-based Systems; Windows 11 Version 25H2 for x64-based Systems. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 8.8, EPSS 0.9%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-41. Sources contributing to this record: circl, cve_org, epss, msrc. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Technology hubs

Windows

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · CIRCL Vulnerability Lookup

    Detected

    Improper resolution of path equivalence in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.

  2. Oct 14, 2026 · CIRCL Vulnerability Lookup

    Updated

    Improper resolution of path equivalence in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.

  3. Oct 16, 2026 · NIST NVD

    Updated

    Improper resolution of path equivalence in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.

Affected

  • microsoft Windows 11 Version 24H2 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 24H2 for x64-based Systemsversion unspecified
  • microsoft Windows 11 Version 25H2 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 25H2 for x64-based Systemsversion unspecified
  • microsoft Windows 11 Version 26H1 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 26H2 for ARM64-based Systemsversion unspecified
  • microsoft Windows 11 Version 26H2 for x64-based Systemsversion unspecified
  • microsoft Windows 11 version 26H1 for x64-based Systemsversion unspecified
  • vendor Microsoft Windows 11 Version 24H2version unspecified
  • vendor Microsoft Windows 11 Version 25H2version unspecified
  • vendor Microsoft Windows 11 Version 26H2version unspecified
  • vendor Microsoft Windows 11 version 26H1version unspecified

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-108463

    Improper resolution of path equivalence in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-108463

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-108463

    30-day exploitation probability 0.9%

    first.org
  • Microsoft Security Update GuideVendor advisoryCVE-2026-108463

    Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems

    msrc.microsoft.com
  • NIST NVDVulnerability recordCVE-2026-108463

    Improper resolution of path equivalence in Windows SmartScreen allows an unauthorized attacker to bypass a security feature over a network.

    nvd.nist.gov

References