CVE-2026-50346 in Windows
Summary
by MITRE • 07/14/2026
Improper authorization in RPC Runtime allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
This vulnerability resides within the rpcrt4.dll component of microsoft windows operating systems and represents a critical authorization flaw that enables local privilege escalation attacks. The rpc runtime service handles remote procedure calls and manages authentication contexts for distributed computing operations, making it a prime target for malicious actors seeking to exploit local system access. When properly functioning, this service should enforce strict authorization checks to ensure that only authenticated processes can invoke specific rpc endpoints with elevated privileges. However, the flaw occurs when the system fails to validate proper authorization tokens or credentials during rpc call processing, allowing an attacker who has already gained local access to manipulate rpc calls and escalate their privileges to system level.
The technical implementation of this vulnerability stems from improper validation within the rpc runtime library where authorization checks are bypassed under certain conditions. Attackers can leverage this weakness by crafting specific rpc requests that exploit the flawed authorization logic, effectively circumventing normal security boundaries that should prevent local users from accessing privileged system functions. This type of flaw typically manifests when the system does not properly verify the calling process identity or fails to validate the security context associated with rpc requests. The vulnerability may be triggered through various attack vectors including malicious service manipulation, direct rpc call injection, or exploitation of legitimate rpc endpoints that have been improperly configured to accept unauthenticated calls.
From an operational perspective, this vulnerability presents a significant risk to organizations as it allows attackers who have already compromised local system access to gain system-level privileges without requiring additional authentication mechanisms. The impact extends beyond simple privilege escalation since many enterprise environments rely on rpc services for inter-process communication and distributed application functionality. Attackers can leverage this weakness to deploy malicious code, modify critical system files, access sensitive data repositories, or establish persistent backdoors within the system. The vulnerability affects multiple windows versions including server and workstation operating systems, making it particularly dangerous in enterprise environments where rpc services are commonly enabled and used for legitimate business operations.
Mitigation strategies should focus on implementing proper authorization controls and maintaining up-to-date system patches from microsoft security updates. Organizations must ensure that rpc services are properly configured with appropriate security settings and that unnecessary rpc endpoints are disabled to reduce the attack surface. System administrators should implement principle of least privilege configurations, regularly audit rpc service permissions, and monitor for suspicious rpc activity patterns. The vulnerability aligns with CWE-284 which addresses improper access control in software systems, and maps to ATT&CK technique T1068 which covers local privilege escalation through system binary manipulation. Additionally, organizations should consider implementing network segmentation controls to limit rpc communication to trusted environments and deploy endpoint detection and response solutions that can identify anomalous rpc behavior patterns indicative of exploitation attempts.