Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
How could an attacker exploit this vulnerability?
An attacker could exploit this vulnerability by sending specially crafted Remote Desktop Protocol (RDP) traffic to a system where Network Level Authentication (NLA) is disabled. The malicious data can interact with improperly initialized memory in the affected component, leading to memory corruption that the attacker may leverage to control how memory is written. This type of issue can allow an attacker to write data to unintended locations in memory, potentially enabling further compromise of the affected system.
Security updates
10.0.17763.9020 — https://support.microsoft.com/help/5099538
10.0.20348.5386 — https://support.microsoft.com/help/5099540
10.0.19044.7548 — https://support.microsoft.com/help/5099539
10.0.26100.33158 — https://support.microsoft.com/help/5099536
10.0.26200.8875 — https://support.microsoft.com/help/5101650
10.0.28000.2525 — https://support.microsoft.com/help/5101649
10.0.14393.9339 — https://support.microsoft.com/help/5099535
6.2.9200.26226 — https://support.microsoft.com/help/5099445
6.3.9600.23291 — https://support.microsoft.com/help/5099444
Vulnerabilities 1
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Critical 9.8CVE-2026-56190 Public exploit
Remote Desktop Protocol Remote Code Execution Vulnerability
Use of uninitialized resource in Windows RDP allows an unauthorized attacker to execute code over a network.
Revision history
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#1
Information published.
References
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CVE-2026-56190 Remote Desktop Protocol Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56190
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss