CVE-2026-85983 in AD LDAP Connector
Summary
by MITRE • 09/09/2026
The Auth0 AD/LDAP Connector improperly processes a configuration value during service startup. This allows a low-privileged user on the host system to modify the connector's configuration. When the service restarts, the modified configuration can lead to code execution with the privileges of the service account.
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Analysis
by VulDB Data Team • 09/09/2026
The Auth0 AD/LDAP Connector vulnerability represents a critical privilege escalation flaw rooted in improper file permission management and insufficient access control mechanisms during the initialization phase of the authentication connector service. This specific weakness allows an attacker who possesses low-privileged user credentials on the host system where the connector is installed to manipulate configuration files that dictate how the connector interacts with Active Directory or LDAP directories. The core technical failure lies in the operating system's file security descriptors, which fail to restrict write access to these critical configuration artifacts exclusively to administrative accounts or the service account itself. Consequently, any local user can alter parameters such as connection strings, credential bindings, or plugin paths without detection by standard audit logs that typically monitor for high-level privilege changes rather than routine file modifications within application directories.
From a technical perspective, this flaw aligns with CWE-732: Incorrect Permission Assignment for Critical Resource, where the system assigns overly permissive access rights to files that control sensitive operational behavior. When the Auth0 AD/LDAP Connector service restarts or initializes after such a modification, it reads the tampered configuration data and executes logic based on those inputs. If an attacker modifies the configuration to point to a malicious library, script, or executable located in a directory where they have write access, the connector will load this untrusted code during its startup sequence. Because authentication connectors typically run with elevated privileges necessary to query domain controllers and manage user sessions, the injected code executes within that high-privilege context, effectively granting the low-privileged attacker full control over the underlying operating system or the identity management infrastructure.
The operational impact of this vulnerability is severe, as it bypasses traditional network-based security controls by leveraging local access on a potentially compromised host. An adversary can achieve remote code execution with the privileges of the service account, which often possesses domain-level permissions depending on how the connector was configured for optimal functionality. This enables lateral movement across the enterprise network, potential exfiltration of sensitive identity data stored in or processed by Auth0, and complete compromise of the authentication pipeline. In a zero-trust architecture, this undermines the principle of least privilege by allowing low-privilege entities to escalate their rights through configuration manipulation rather than exploiting software logic errors directly.
Mitigation strategies must focus on enforcing strict file system permissions and enhancing monitoring capabilities. Administrators should immediately audit the directory structure containing Auth0 connector configurations and ensure that write access is restricted solely to the service account or designated administrators, removing write privileges from standard user groups such as Users or Guests. Implementing mandatory integrity control levels for these directories can prevent modification by lower-integrity processes. Furthermore, organizations should deploy endpoint detection and response solutions configured to alert on changes to configuration files associated with authentication services, particularly during off-hours or outside of known deployment windows. Regular vulnerability scanning focused on file permission misconfigurations is also recommended to identify similar weaknesses in other identity management components before they can be exploited by threat actors seeking initial footholds for privilege escalation attacks aligned with the MITRE ATT&CK technique T1098: Account Manipulation, specifically through SSH Authorized Keys or Windows Service Registry modifications depending on the platform context.