CVE-2026-85981 in AD LDAP Connector
Summary
by MITRE • 09/09/2026
The administrative panel of the Auth0 AD/LDAP Connector (versions 6.5.0 and earlier) listens on the local loopback interface without requiring authentication. This allows a local, low-privileged user or process on the host system to access the panel's management endpoints without credentials. Through these endpoints, a local user can read configuration details, including plaintext Active Directory service account credentials, and modify connector settings.
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Analysis
by VulDB Data Team • 09/09/2026
The Auth0 AD/LDAP Connector administrative interface presents a critical security vulnerability in versions 6.5.0 and earlier due to its network binding configuration. The management panel is configured to listen on the local loopback interface without enforcing any form of authentication or access control mechanisms. This architectural decision creates an open door for any process running with user-level privileges on the host system to interact directly with the connector's administrative endpoints. By bypassing standard security controls, a malicious actor who has gained even low-privileged shell access can exploit this misconfiguration to gain unauthorized visibility into and control over the identity management infrastructure managed by Auth0.
The technical flaw lies in the absence of authentication checks for requests directed at the local administration interface. While binding services to localhost is often intended to restrict external network-based attacks, it assumes that all local users are trusted entities within a secure multi-tenant environment or isolated container. In this case, the assumption fails because the connector does not validate the identity of the caller before processing administrative commands. This allows an attacker with basic user-level access on the server hosting the Auth0 AD/LDAP Connector to send HTTP requests directly to localhost ports associated with the management panel. The lack of authentication means that no credentials are required, effectively rendering any local privilege escalation or lateral movement efforts significantly easier by providing immediate access to sensitive configuration data and control mechanisms.
The operational impact of this vulnerability is severe due to the sensitivity of the exposed information and capabilities. An attacker can read detailed configuration settings from the connector, most critically including plaintext Active Directory service account credentials stored in memory or disk configurations accessible via these endpoints. These credentials are typically high-privilege accounts used for directory synchronization and user provisioning within an organization's identity provider ecosystem. Compromise of these secrets allows an adversary to authenticate as a domain admin or equivalent role, potentially leading to full compromise of the Active Directory environment. Furthermore, the ability to modify connector settings enables an attacker to alter authentication flows, redirect traffic, disable security logging, or inject malicious configurations that could facilitate broader network infiltration and persistent access without detection by standard monitoring tools.
This vulnerability aligns with CWE-287 Improper Authentication, as the system fails to verify the identity of a user before granting access to administrative functions. It also relates to CWE-16 Configuration, specifically involving insecure default configurations where security controls are not enabled or properly restricted based on threat models. From an offensive perspective, this scenario maps directly to MITRE ATT&CK technique T1078 Valid Accounts, as the attacker leverages legitimate but misconfigured credentials obtained through local access. Additionally, it falls under T1552 Unsecured Credentials because plaintext secrets are exposed via a locally accessible interface that lacks encryption or authentication safeguards at the application layer.
Mitigation strategies must focus on immediate remediation of the configuration and long-term hardening of identity management components. Organizations running affected versions should immediately upgrade to Auth0 AD/LDAP Connector version 6.5.1 or later, where this binding behavior has been corrected to require proper authentication for local administrative access. In environments where upgrading is not immediately feasible, network segmentation strategies can be employed to restrict localhost traffic if the connector runs in a containerized environment with strict isolation policies. However, since loopback interfaces are typically internal to the host OS, application-level fixes remain the primary defense. Security teams should also audit existing deployments for any other services bound to localhost without authentication and enforce principle of least privilege by ensuring that only authorized system accounts can interact with administrative APIs. Regular vulnerability scanning focused on local service exposure and credential hygiene will help prevent similar misconfigurations in future deployments.