CVE-2026-58546: Microsoft Windows RDP information disclosure via uninitialized resource

CVE-2026-58546 · Severity: medium · CVSS 6.5 · Published 2026-07-14

A security vulnerability exists in the Windows Remote Desktop Protocol (RDP), which is commonly used for remote access to computers and servers. An attacker could exploit this flaw to gain access to sensitive information stored in the system's memory. While the attack can be launched over a network, it requires a user to perform a specific action, such as clicking a link or opening a malicious file, before the information can be stolen.

Technologies: Microsoft Windows 11, Microsoft Windows 10, Microsoft Windows Server 2012. Vendors: Microsoft.

Quick answers

Is CVE-2026-58546 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58546 being exploited in the wild.
How severe is CVE-2026-58546?
Medium severity, with a CVSS score of 6.5, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 10.0.26100.0 to 10.0.26100.8875; Microsoft Windows 10 10.0.14393.0 to 10.0.14393.9339; Microsoft Windows Server 2012 6.2.9200.0 to 6.2.9200.26226.
Is there a fix for CVE-2026-58546?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-58546 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-58546?
Check whether you run Microsoft Windows 11, Microsoft Windows 10 or Microsoft Windows Server 2012 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This vulnerability is classified as a 'Use of Uninitialized Resource' (CWE-908) within the Windows Remote Desktop Protocol (RDP) implementation. An unauthenticated attacker can exploit this by sending specially crafted requests over the network, though the attack requires user interaction (UI:R) to succeed. Successful exploitation allows the attacker to read sensitive information from the memory of the affected system. The vulnerability impacts a wide range of Windows client and server versions, and Microsoft has released security updates to address the issue.

Affected products

  • Microsoft Windows 10 Version 1607 10.0.14393.0 to 10.0.14393.9339
  • Microsoft Windows 10 Version 1809 10.0.17763.0 to 10.0.17763.9020
  • Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
  • Microsoft Windows 10 Version 22H2 10.0.19045.0 to 10.0.19045.7548
  • Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
  • Microsoft Windows Server 2012 6.2.9200.0 to 6.2.9200.26226

Timeline

  • 2026-07-14: disclosed
  • 2026-07-14: advisory

References

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