CVE-2026-58533: Microsoft Windows RDP information disclosure via uninitialized resource

CVE-2026-58533 · 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 initiated over a network, it requires a user to perform a specific action, such as clicking a link or opening a malicious file, to be successful.

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

Quick answers

Is CVE-2026-58533 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58533 being exploited in the wild.
How severe is CVE-2026-58533?
Medium severity, with a CVSS score of 6.5, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 Versions 24H2, 25H2, 26H1; Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All installations.
Is there a fix for CVE-2026-58533?
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-2026-58533 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-58533?
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

A vulnerability classified as 'Use of Uninitialized Resource' (CWE-908) exists in the Microsoft Windows Remote Desktop Protocol (RDP) implementation. The flaw allows an unauthenticated, remote attacker to disclose sensitive information from the memory of an affected system. Exploitation requires user interaction, typically involving a victim connecting to a malicious RDP server or interacting with a malicious link. The vulnerability stems from the system failing to properly initialize a resource before it is accessed or transmitted over the network. Microsoft has released security updates to address this issue across multiple versions of Windows and Windows Server.

Affected products

  • Microsoft Windows 10 Versions 1607, 1809, 21H2, 22H2
  • Microsoft Windows 11 Versions 24H2, 25H2, 26H1
  • Microsoft Windows Server 2012 All installations

Timeline

  • 2026-07-14: advisory: Initial disclosure by Microsoft and NVD publication

References

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