🟠 High | Source: Microsoft Security Response Center
CVE-2026-56171 is an information disclosure vulnerability in Windows Remote Desktop Protocol (RDP) that allows an unauthenticated attacker to intercept or expose private data transmitted over a network connection. The flaw stems from improper handling of sensitive information, meaning personal or confidential data could be accessed without any valid credentials. RDP is widely used to manage Windows-based cloud virtual machines, making this a significant risk for Azure and hybrid environments.
Security Architect’s Take: Audit all Azure VMs and virtual desktop environments (including Azure Virtual Desktop) with RDP exposed — even indirectly — and apply the Microsoft patch immediately; in the interim, restrict RDP access to trusted IP ranges via NSGs and enforce Just-in-Time VM access through Microsoft Defender for Cloud to minimise the attack surface.
Original advisory: CVE-2026-56171 Windows Remote Desktop Protocol (RDP) Information Disclosure Vulnerability