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CVE-2026-58539 Microsoft CVE debrief

CVE-2026-58539 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 score of 6.5 and a severity of MEDIUM. Microsoft has released a patch for this vulnerability. This vulnerability affects Windows 10, Windows 11, and Windows Server systems. The vulnerability is an out-of-bounds read in Windows RDP that allows an unauthorized attacker to disclose information over a network. Administrators and users of these systems should be aware of this vulnerability and take steps to mitigate it.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

Administrators and users of Windows 10, Windows 11, and Windows Server systems should be aware of this vulnerability and take steps to mitigate it. This includes reviewing and applying the patch released by Microsoft, ensuring that Windows RDP is properly configured and secured, and monitoring for any suspicious activity related to this vulnerability.

Technical summary

The vulnerability is an out-of-bounds read in Windows RDP that allows an unauthorized attacker to disclose information over a network. The vulnerability has been assigned a CVSS score of 6.5 and a severity of MEDIUM. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N. This vulnerability affects Windows 10, Windows 11, and Windows Server systems.

Defensive priority

Medium

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Ensure that Windows RDP is properly configured and secured
  • Monitor for any suspicious activity related to this vulnerability
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The vulnerability is described in the CVE record and the NVD detail page. Microsoft has released a patch for this vulnerability. Evidence from the CVE record indicates that this is an out-of-bounds read vulnerability in Windows RDP. The NVD entry provides additional context on the vulnerability's impact. Defenders should verify affected systems and apply the patch. The CVE record was published on 2026-07-14T18:18:41.200Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58539 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58539

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

  • CVE-2026-58539 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58539

    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.