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PatchSiren cyber security CVE debrief

CVE-2026-78455 Microsoft CVE debrief

A CVE record for an out-of-bounds read vulnerability in Xbox was published on 2026-09-08T18:20:44.123Z and last modified on 2026-09-11T20:05:41.790Z. The vulnerability allows an unauthorized attacker to disclose information with a physical attack. Microsoft has provided a patch for this vulnerability. The vulnerability is an out-of-bounds read in Xbox that allows an unauthorized attacker to disclose information with a physical attack. The CVSS score is 4.3 and the severity is MEDIUM. Defenders should assess exposure and apply patches provided by Microsoft.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 4.3
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 Xbox systems, particularly those with physical access to the systems, should assess exposure and apply patches provided by Microsoft.

Why it matters

Defenders should care about this vulnerability because it allows an unauthorized attacker to disclose information with a physical attack, and Microsoft has provided patches to mitigate this vulnerability.

  • Potential information disclosure with a physical attack
  • Need to assess exposure of Xbox systems to this vulnerability
  • Priority to apply patches provided by Microsoft

Technical summary

The vulnerability is an out-of-bounds read in Xbox that allows an unauthorized attacker to disclose information with a physical attack. The CVSS score is 4.3 and the severity is MEDIUM. The vulnerability allows an unauthorized attacker to disclose information with a physical attack. Microsoft has provided a patch for this vulnerability. Defenders should assess exposure and apply patches provided by Microsoft.

Defensive priority

Medium priority for defenders to assess exposure and apply patches

Recommended defensive actions

  • Assess exposure of Xbox systems to this vulnerability
  • Apply patches provided by Microsoft
  • Monitor for potential information disclosure attempts

Evidence notes

The CVE record and NVD vulnerability detail provide information on the vulnerability, its impact, and affected systems. The vulnerability allows an unauthorized attacker to disclose information with a physical attack. Microsoft has provided a patch for this vulnerability. The vulnerability is an out-of-bounds read in Xbox. The CVSS score is 4.3 and the severity is MEDIUM.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78455 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78455

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

  • CVE-2026-78455 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78455

    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.