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CVE-2026-42908 Microsoft CVE debrief

CVE-2026-42908 is a high-severity vulnerability in Windows RDP that allows unauthorized attackers to disclose information over a network. The vulnerability has a CVSS score of 7.5 and is classified as HIGH. It was published on 2026-06-09 and last modified on 2026-06-17. The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. Microsoft has provided a vendor advisory for this vulnerability [ref-4].

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-17
Advisory published
2026-06-09
Advisory updated
2026-06-17

Who should care

Administrators and users of Windows RDP should be aware of this vulnerability and take necessary precautions to prevent exploitation. This vulnerability can be used by attackers to disclose sensitive information over a network.

Technical summary

CVE-2026-42908 is an out-of-bounds read vulnerability in Windows RDP that allows unauthorized attackers to disclose information over a network. The vulnerability has a CVSS vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. It affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. The vulnerability is classified as CWE-125.

Defensive priority

High

Recommended defensive actions

  • Apply the latest security patches and updates for Windows RDP
  • Implement network segmentation to limit the spread of the vulnerability
  • Use secure communication protocols, such as encryption, to protect sensitive information
  • Monitor network traffic for suspicious activity
  • Implement access controls, such as authentication and authorization, to limit access to sensitive resources
  • Regularly review and update security configurations to ensure they are current and effective

Evidence notes

The information provided is based on the CVE record and NVD detail [cve-org] [nvd]. The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server [source-item].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42908 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42908

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

  • CVE-2026-42908 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42908

    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.