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CVE-2026-58546 Microsoft CVE debrief

CVE-2026-58546 is a medium-severity vulnerability in Windows RDP that allows unauthorized attackers to disclose information over a network. The vulnerability is caused by the use of an uninitialized resource. This vulnerability affects Windows RDP servers and clients. The CVSS score is 6.5 and the CVSS severity is MEDIUM. The vulnerability has a significant impact on the confidentiality of information. System administrators and security teams should prioritize patching this vulnerability to prevent potential information disclosure.

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

System administrators and security teams responsible for Windows RDP servers and clients should prioritize patching this vulnerability to prevent potential information disclosure. This vulnerability has a significant impact on the confidentiality of information. Security teams should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

The CVE-2026-58546 vulnerability is caused by the use of an uninitialized resource in Windows RDP. This allows an unauthorized attacker to disclose information over a network. The vulnerability has a CVSS score of 6.5 and a CVSS 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. The vulnerability affects Windows RDP servers and clients.

Defensive priority

Patching this vulnerability is a high priority for Windows RDP servers and clients to prevent potential information disclosure.

Recommended defensive actions

  • Apply the patch provided by Microsoft to fix the vulnerability.
  • Review and update Windows RDP configurations to ensure secure settings.
  • Monitor Windows RDP logs for potential exploitation attempts.
  • Consider implementing additional security controls, such as network segmentation and access controls.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE-2026-58546 vulnerability is documented in the NVD and CVE.org databases. Microsoft has provided a patch for the vulnerability. The vulnerability allows unauthorized attackers to disclose information over a network. The use of an uninitialized resource in Windows RDP is the root cause of the vulnerability. The CVE record was published on 2026-07-14T18:18:42.720Z and has not been modified since then. The NVD entry is currently Analyzed. To verify the vulnerability, defenders should review the official advisory and CVE record.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58546 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58546

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

  • CVE-2026-58546 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58546

    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.