CVE-2026-70137 in Windows
Summary
by MITRE • 10/14/2026
Improper access control in Windows Remote Access Connection Manager allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified as improper access control within the Windows Remote Access Connection Manager represents a significant security flaw that undermines the integrity of local system resources. This component, responsible for managing remote connections and authentication processes on Microsoft Windows operating systems, contains logic errors or misconfigurations in its permission checks. Specifically, the service fails to adequately restrict access to sensitive internal data structures or configuration states when handling requests from authenticated users. While the attacker is required to have valid credentials to initiate an attack, this requirement does not sufficiently mitigate the risk because the underlying mechanism allows for unauthorized reading of protected information that should be isolated even from legitimate session contexts.
From a technical perspective, the flaw stems from insufficient validation of access rights during specific operations performed by the Connection Manager service. When processing local requests related to connection status, routing tables, or cached authentication tokens, the application does not enforce strict separation between user-level privileges and system-level data visibility. This oversight allows an authenticated actor to query internal states that are intended for administrative use only. By exploiting this gap in access control logic, the attacker can extract detailed information about network configurations, active sessions, and potentially sensitive identifiers stored within the connection manager's memory or configuration files. The exploitation does not require elevation of privilege beyond existing user rights but relies on abusing the trust placed in authenticated local interactions with the service.
The operational impact of this vulnerability centers primarily on information disclosure rather than direct system compromise or denial of service. An attacker who successfully exploits this flaw can gather critical intelligence about the target environment, including details about network topology, active remote access sessions, and potentially cached credentials or security tokens associated with those connections. This data serves as a valuable reconnaissance asset for further attacks, such as lateral movement within a corporate network or targeted phishing campaigns based on observed user activity patterns. Although the immediate effect is limited to reading information, the exposure of these details can significantly lower the barrier for subsequent high-impact exploits by revealing weak points in authentication mechanisms or identifying high-value targets connected through remote access channels.
In alignment with industry standards, this vulnerability maps directly to CWE-269, which classifies Improper Privilege Management where an actor is able to perform actions beyond their intended permissions. Furthermore, the exploitation technique aligns with MITRE ATT&CK tactic T1087, Account Discovery, as it involves gathering information about user accounts and system configurations from a local perspective. The specific method of accessing internal service data without proper authorization also reflects aspects of CWE-200, Information Exposure, where sensitive details are made available to unauthorized parties through improper handling by the software itself.
Mitigation strategies for this vulnerability focus on both immediate remediation and long-term architectural improvements. Microsoft has addressed similar issues in past security updates, so applying the latest cumulative patches is the primary defense against known instances of this flaw. Administrators should ensure that all Windows systems are updated to versions where these access control checks have been hardened. Additionally, implementing strict network segmentation can limit the blast radius if an attacker gains local foothold on a system running vulnerable services. Reducing the attack surface by disabling unnecessary remote access features and enforcing multi-factor authentication for any remaining administrative interfaces further diminishes the likelihood of successful exploitation. Regular auditing of service permissions and monitoring for anomalous queries to connection manager APIs can also aid in early detection of attempted exploits.