The 'missing authentication' label on CVE-2026-61364 deserves closer scrutiny than typical EoP advisories receive. This framing signals something different from a simple bypass or injection flaw—it points to a function that performs privileged work without verifying caller identity, which is almost always an architectural decomposition failure rather than an implementation oversight. In the RDS context, this is particularly consequential because the service intentionally allows authenticated users to establish sessions and interact with shared infrastructure, meaning the trust contract for this function was never properly specified.
The CVSS 7.8 is doing important analytical work. If exploitation truly required nothing beyond valid RDS access—which many enterprise users have—you would expect a base score closer to 9.0. The fact that Microsoft assessed this at 7.8 suggests the vulnerable code path isn't trivially reachable; it likely requires a specific session configuration, a particular redirection feature enabled, or an unusual sequence of API calls to trigger the privileged path. The 'authorized attacker' language in the CVE bounds exploitation to authenticated contexts, but the critical unanswered question is what kind of authenticated: does this require an active RDS session with specific characteristics, or can it be triggered through clipboard redirection channels or COM object instantiation from within any valid session?
The practical blast radius depends heavily on your environment. Remote Desktop Services frequently serves as a jump server or thin-client protocol in enterprise architectures—a compromised RDS session often provides access to the machine that bridges user space to dozens of other systems. A contractor with legitimate RDS access to a development environment who elevates to SYSTEM isn't just gaining local privileges; they're gaining a foothold that may connect to production dependencies. This makes the 'high' CVSS potentially understate exposure in environments where RDS serves as a primary access vector.
Defenders should prioritize three actions: first, enumerate which users have RDS access in your environment and treat that list as your effective attack surface for this CVE; second, identify whether any specific session configurations, redirection features, or COM objects are required to reach the vulnerable path—this is where Microsoft's attack complexity assessment is encoded; third, accelerate patching timelines for RDS components specifically, because institutional inertia around RDS patching is well-documented and the exposure window for this class of flaw extends well beyond what organizations would tolerate for kernel vulnerabilities.