Description

Missing authentication for critical function in Windows Remote Desktop Services allows an authorized attacker to elevate privileges locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-11T17:18:10.303Z",
  "pubdate": "2026-08-11T17:18:10.303Z",
  "executiveSummary": "This vulnerability involves a missing authentication flaw affecting Windows Remote Desktop Services. The security deficiency permits an authorized attacker to execute unauthorized actions, resulting in a local privilege escalation on targeted systems. The affected product is Windows Remote Desktop Services, and the risk implication centers on the potential compromise of host integrity and unauthorized access to higher-privilege operating system contexts. Exploitation of this security weakness requires the adversary to possess prior authorized access to the local environment and the ability to interact directly with the vulnerable critical function. The attacker capabilities are constrained to local execution, lacking remote network vector components based on the available threat scope. Because the vulnerability bypasses intended authorization boundaries within critical service functions, malicious actors can leverage this vector to escalate privileges from a standard user context to a privileged system state. Remediation requires addressing the improper authorization controls within the affected remote desktop architecture to ensure all critical execution paths correctly validate caller privileges before granting access to sensitive functional operations.",
  "technicalDetails": "The root cause of this vulnerability stems from missing authentication checks within a critical function handled by Windows Remote Desktop Services. Specifically, the vulnerable component fails to adequately verify whether an invoking process or user possesses the necessary authorization credentials before executing privileged logic or internal routines.\nExploitation of this flaw occurs locally. An authorized attacker with restricted privileges on the target host can interact directly with the exposed critical function or internal API endpoint. Because the component lacks proper access validation, the malicious actor can invoke the function directly without supplying valid cryptographic proofs or session tokens that would normally be required for such operations.\nThe attack flow proceeds as follows: First, the attacker establishes a local execution context on the target Windows system using standard, non-elevated user credentials. Second, the attacker formulates an input payload or directly calls the vulnerable function exposed by Windows Remote Desktop Services. Third, due to the absence of robust authentication mechanisms within the targeted routine, the service processes the request as valid and executes the underlying code paths. Finally, the execution of these unprotected routines grants the attacker elevated privileges within the local operating system environment.\nThe post-exploitation impact includes unauthorized privilege escalation, allowing the adversary to perform administrative tasks, access protected system resources, or install persistent payloads. The vulnerability requires local access and prior user authorization on the system, meaning unauthenticated remote attackers cannot trigger this specific flaw across a network interface unless combined with an independent remote code execution vector. Network exposure for this specific vulnerability vector remains strictly local, relying on internal component interaction rather than listening network sockets, unless Remote Desktop Protocol services expose the flawed internal mechanism directly."
}