# CVE-2026-56190: Microsoft Windows RDP remote code execution via uninitialized resource

Source: https://junglewise.ai/threats/cve-2026-56190-microsoft-windows-rdp-remote-code-execution-via-uninitialized  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-56190 · Severity: critical · CVSS 9.8 · Published 2026-07-14

A critical vulnerability exists in the Windows Remote Desktop Protocol (RDP), which is used to remotely access and manage computers. An unauthorized attacker can exploit this flaw over a network to take full control of a vulnerable system without any user interaction. This could lead to complete data theft, system outages, or the deployment of ransomware across the corporate network.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10), [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-56190 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-56190 being exploited in the wild.

**How severe is CVE-2026-56190?** Critical severity, with a CVSS score of 9.8, 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 editions.

**Is there a fix for CVE-2026-56190?** 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-2026-56190 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-56190?** 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 remote code execution vulnerability exists in the Microsoft Windows Remote Desktop Protocol (RDP) due to the use of an uninitialized resource (CWE-908). The flaw allows an unauthenticated, remote attacker to send specially crafted requests to a target system's RDP service. Successful exploitation enables the attacker to execute arbitrary code with high privileges on the host system. The vulnerability is network-exploitable with low complexity and requires no user interaction. Microsoft has released security updates to address this issue across affected Windows and Windows Server versions.

## Affected products

- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 24H2, 25H2, 26H1
- Microsoft Windows Server 2012 All editions

## Timeline

- 2026-07-14: disclosed: Vulnerability published by Microsoft and NVD.
- 2026-07-14: advisory: MSRC advisory released.

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56190](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56190)

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