CVE-2026-50295 in Windows
Summary
by MITRE • 07/14/2026
Improper privilege management in Microsoft Windows DNS allows an authorized attacker to bypass a security feature locally.
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Analysis
by VulDB Data Team • 07/15/2026
This vulnerability represents a critical weakness in Microsoft Windows Domain Name System implementation where insufficient privilege validation enables unauthorized local access to restricted security features. The flaw exists within the Windows DNS server component that fails to properly enforce access controls for privileged operations, allowing attackers with legitimate user credentials to escalate their privileges and bypass intended security boundaries. Such improper privilege management directly violates fundamental security principles and creates opportunities for lateral movement within network environments where DNS services are deployed.
The technical nature of this vulnerability stems from inadequate validation of user permissions when processing DNS requests or administrative commands. Attackers can exploit this weakness by leveraging legitimate authentication credentials to perform operations that should only be available to system administrators or specific privileged accounts. This misconfiguration allows for unauthorized access to DNS zone data, configuration modifications, and potentially the ability to manipulate DNS resolution behavior across the affected network infrastructure. The vulnerability's local attack vector means that exploitation requires only user-level access on the target system, making it particularly dangerous in environments where user accounts may have elevated privileges through legitimate business processes.
From an operational impact perspective, this vulnerability creates significant risk for organizations relying on Windows DNS services for network infrastructure management. An attacker who successfully exploits this weakness can gain access to sensitive DNS zone information including host records, service records, and other critical network mapping data that could facilitate further attacks. The compromised DNS server may also become a platform for more sophisticated attacks such as DNS cache poisoning or man-in-the-middle scenarios that can disrupt network services and compromise data integrity across the entire domain. Network monitoring systems that depend on accurate DNS information may be misled by malicious modifications to DNS records, potentially masking other security incidents.
Organizations should implement immediate mitigations including applying Microsoft security patches and updates, reviewing and hardening DNS server configurations, and implementing strict access controls for DNS administration functions. Network segmentation and privilege separation practices should be reinforced to minimize the potential impact of any successful exploitation attempts. Security monitoring should be enhanced to detect unusual DNS query patterns or administrative activities that might indicate exploitation attempts. The vulnerability aligns with CWE-276 which addresses improper privilege management, and represents a technique commonly associated with attack paths in the MITRE ATT&CK framework under privilege escalation and credential access domains, specifically targeting the use of local accounts to bypass security controls for network services.
This weakness demonstrates how fundamental access control mechanisms can be undermined through inadequate implementation of privilege validation checks within core system components. The vulnerability's persistence in Windows DNS implementations highlights the importance of thorough security testing and validation of administrative interfaces, particularly those that handle sensitive network infrastructure data. Organizations should conduct comprehensive assessments of their DNS server configurations to identify any additional privilege management weaknesses and implement defense-in-depth strategies that reduce the attack surface for such exploitation techniques.