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CVE-2026-78454 Microsoft CVE debrief

CVE-2026-78454 is a MEDIUM-severity vulnerability in the Windows CD-ROM Driver that allows an authorized local attacker to disclose information. The CVE record was published on 2026-09-08T18:20:43.973Z and was last modified on 2026-09-11T18:55:06.920Z. The NVD entry is currently Analyzed. This vulnerability is an out-of-bounds read issue in the Windows CD-ROM Driver, which could allow an authorized local attacker to disclose information. Defenders responsible for Windows environments, especially those where local access is a concern, should assess exposure and prioritize patching. The CVSS score is 5.5, and the severity is MEDIUM. Affected systems include various versions of and

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-11
Advisory published
2026-09-08
Advisory updated
2026-09-11

Who should care

Defenders responsible for Windows environments, especially those where local access is a concern, should assess exposure and prioritize patching.

Why it matters

CVE-2026-78454 is a MEDIUM-severity vulnerability that allows local information disclosure in Windows environments. Defenders should prioritize verifying exposure and applying patches.

  • Verify potential information disclosure in Windows environments
  • Assess exposure in local access scenarios
  • Prioritize patching for Windows CD-ROM Driver

Technical summary

The vulnerability is an out-of-bounds read in the Windows CD-ROM Driver, which allows an authorized local attacker to disclose information. The CVSS score is 5.5, and the severity is MEDIUM. Affected systems include various versions of Windows 10, Windows 11, and Windows Server.

Defensive priority

Defenders should prioritize verifying exposure in Windows environments, especially where local access is a concern, and apply patches as available.

Recommended defensive actions

  • Verify exposure in Windows environments, especially where local access is a concern
  • Apply patches as available from Microsoft
  • Monitor systems for potential information disclosure

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, including its description, CVSS score, and affected systems. Microsoft has provided a patch advisory for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78454 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78454

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

  • CVE-2026-78454 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78454

    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.