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CVE-2026-78451 Microsoft CVE debrief

A vulnerability in Microsoft Windows SCSI Class System File allows an unauthorized attacker to elevate privileges with a physical attack. This issue is rated as MEDIUM with a CVSS score of 6.8. The CVE record was published on 2026-09-08T18:20:43.480Z and has not been modified since then. The NVD entry is currently Analyzed. This vulnerability exists in the Windows SCSI Class System File and allows an attacker to elevate privileges through a physical attack, which could lead to significant security breaches if not addressed promptly. Defenders should prioritize patching vulnerable systems, especially those exposed to physical attacks, and verify and apply the latest security updates

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
MEDIUM 6.8
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 systems, especially those exposed to physical attacks or with high security requirements, should assess their exposure and apply patches. System administrators and security teams need to verify the vulnerability status of their Windows installations and apply necessary updates.

Why it matters

CVE-2026-78451 is a medium-severity vulnerability in Windows SCSI Class System File that allows privilege escalation through a physical attack. Defenders should prioritize patching, restrict physical access, and monitor system updates to mitigate this vulnerability.

  • Verify and apply patches to prevent privilege escalation.
  • Restrict physical access to sensitive systems to reduce attack surface.
  • Monitor system updates and ensure timely application of security patches.

Technical summary

The vulnerability exists in the Windows SCSI Class System File and allows an attacker to elevate privileges through a physical attack. This issue has been rated as MEDIUM with a CVSS score of 6.8. The CVSS vector is CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

Defenders should prioritize patching vulnerable systems, especially those exposed to physical attacks. Verify and apply the latest security updates from Microsoft.

Recommended defensive actions

  • Apply patches from Microsoft for vulnerable Windows versions.
  • Verify and update Windows systems to the latest version.
  • Restrict physical access to sensitive systems.

Evidence notes

The vulnerability is described as an untrusted pointer dereference in Microsoft Windows SCSI Class System File. The CVSS vector is CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, indicating a medium severity vulnerability that requires physical access but can lead to high impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78451 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78451

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

  • CVE-2026-78451 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78451

    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.