CVE-2026-58535: Microsoft Windows RDP information disclosure via uninitialized resource

CVE-2026-58535 · Severity: medium · CVSS 6.5 · Published 2026-07-14

A security vulnerability exists in the Windows Remote Desktop Protocol (RDP), a feature used to remotely access and control computers over a network. An attacker could exploit this flaw to gain access to sensitive information that should otherwise be protected. While the attack can be launched over the network, it requires a user to take a specific action, such as clicking a link or opening a malicious file, before the attacker can view the data.

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

Quick answers

Is CVE-2026-58535 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-58535 being exploited in the wild.
How severe is CVE-2026-58535?
Medium severity, with a CVSS score of 6.5, published 14 July 2026.
Which products and versions are affected?
Microsoft Windows 11 24H2, 25H2, 26H1; Microsoft Windows 10 1607, 1809, 21H2, 22H2; Microsoft Windows Server 2012 All versions including Server Core.
Is there a fix for CVE-2026-58535?
A patch was published on 2026-07-14: Security updates made available by Microsoft Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-58535 attacked?
It is attacked over the network, in an operating system.
Am I affected by CVE-2026-58535?
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 over the network to disclose sensitive information from the memory of the affected system. The attack requires user interaction, meaning a target user must be induced to perform an action (such as connecting to a malicious RDP server or clicking a crafted link) to trigger the leak. Microsoft has released security updates to address this issue across various versions of Windows 10, Windows 11, and Windows Server 2012.

Affected products

  • Microsoft Windows 10 1607, 1809, 21H2, 22H2
  • Microsoft Windows 11 24H2, 25H2, 26H1
  • Microsoft Windows Server 2012 All versions including Server Core

Timeline

  • 2026-07-14: advisory: Initial disclosure by Microsoft and NVD
  • 2026-07-14: patched: Security updates made available by Microsoft

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.