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CVE-2026-78463 Microsoft CVE debrief

CVE-2026-78463 debrief based on the supplied source corpus. The CVE record was published on 2026-09-08T18:20:44.800Z and has not been modified since then. This high-severity code injection vulnerability in Remote Desktop Client allows an unauthorized attacker to execute code over a network. Defenders responsible for Remote Desktop Client deployments, network administrators, and security teams should assess exposure and prioritize remediation. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. The CVE record and NVD entry provide details on the code injection vulnerability in Remote Desktop Client.

Vendor
Microsoft
Product
Remote Desktop client for Windows Desktop
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-22
Advisory published
2026-09-08
Advisory updated
2026-09-22

Who should care

Defenders responsible for Remote Desktop Client deployments, network administrators, and security teams should assess exposure and prioritize remediation.

Why it matters

CVE-2026-78463 is a high-severity code injection vulnerability in Remote Desktop Client. Defenders should prioritize verifying exposure, assessing network attack paths, and applying vendor remediation to prevent potential code execution over the network.

  • Potential code execution over the network
  • Possible unauthorized access to sensitive data
  • Required verification of affected versions and deployments
  • Necessity for timely application of vendor remediation

Technical summary

CVE-2026-78463 is a code injection vulnerability in Remote Desktop Client. An unauthorized attacker can exploit this vulnerability to execute code over a network. The vulnerability has a CVSS score of 8.8 and is considered HIGH severity. This vulnerability affects Remote Desktop Client deployments, and defenders should prioritize verifying exposure, assessing network attack paths, and applying vendor remediation to prevent potential code execution over the network.

Defensive priority

Defenders should prioritize verifying exposure of Remote Desktop Client to this code injection vulnerability, assessing potential network attack paths, and applying vendor remediation when available.

Recommended defensive actions

  • Verify exposure of Remote Desktop Client to this code injection vulnerability
  • Assess potential network attack paths
  • Apply vendor remediation when available
  • Monitor for suspicious activity
  • Inventory and track Remote Desktop Client deployments

Evidence notes

The CVE record and NVD entry provide details on the code injection vulnerability in Remote Desktop Client. However, additional information on affected versions, exploitation, and remediation may require verification from official sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78463 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78463

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

  • CVE-2026-78463 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78463

    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.