CVE-2026-50333 in Windows
Summary
by MITRE • 07/14/2026
Missing authentication for critical function in Windows Spaceport.sys allows an authorized attacker to elevate privileges locally.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 07/15/2026
The vulnerability described represents a critical authentication bypass flaw within the Windows Spaceport.sys driver component that enables local privilege escalation attacks. This issue stems from insufficient authorization checks during critical system operations, allowing an attacker who already possesses user-level access to exploit this weakness and gain elevated privileges. The Spaceport.sys driver serves as a kernel-mode component responsible for managing certain spaceport-related functionalities within the Windows operating system, making it a prime target for privilege escalation attacks due to its deep integration with core system services.
The technical implementation of this vulnerability manifests through inadequate validation of caller credentials when executing sensitive functions within the driver. When legitimate system calls are made to Spaceport.sys, the driver fails to properly authenticate whether the requesting process has sufficient privileges to perform the requested operation. This authentication gap creates a pathway for malicious actors to manipulate kernel-mode operations using forged or improperly validated security tokens. The flaw typically occurs during function dispatch mechanisms where the driver does not adequately verify the security context of incoming requests, allowing unauthorized code execution within kernel space. Such vulnerabilities fall under the CWE-284 access control weakness category, specifically addressing insufficient access control mechanisms in protected system components.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it enables attackers to bypass fundamental Windows security controls and access restricted system resources. Once elevated, an attacker can manipulate kernel data structures, modify system files, disable security features, and establish persistent backdoors within the target system. The local nature of this attack means that exploitation requires initial user-level access, but the resulting privilege escalation provides complete control over the affected machine. This vulnerability aligns with several ATT&CK tactics including privilege escalation through kernel manipulation and persistence via system-level modifications. Attackers can leverage this weakness to establish stealthy footholds within enterprise networks where local access might be obtained through social engineering, phishing campaigns, or other initial compromise vectors.
Mitigation strategies for this vulnerability require immediate patch deployment from Microsoft as part of regular security updates, since the flaw exists in core Windows operating system components. System administrators should implement comprehensive monitoring solutions to detect unusual kernel-mode activity patterns that may indicate exploitation attempts. Additional protective measures include restricting local user access where possible through proper least privilege principles and implementing robust endpoint detection and response capabilities. Organizations should also conduct regular vulnerability assessments focusing on kernel-mode drivers and ensure that all system components are maintained with current security patches. The remediation process must include thorough testing of patches in controlled environments before widespread deployment to prevent potential system instability issues. Security teams should monitor for indicators of compromise related to abnormal privilege escalation events and maintain detailed audit logs of driver activity for forensic analysis purposes.