CVE-2026-82067 in Server
Summary
by MITRE • 09/08/2026
Improper handling of case sensitivity in the configuration validation component of MongoDB Server may cause the authorization subsystem to remain in a default disabled state during server startup. An unauthenticated user with network access to a deployment where this condition occurs can perform arbitrary administrative operations, resulting in full impact of data confidentiality, integrity, and availability.
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Analysis
by VulDB Data Team • 09/08/2026
The vulnerability described involves a critical flaw within the configuration validation component of MongoDB Server, specifically related to how case sensitivity is handled during the initialization process. This issue stems from an improper comparison logic where the system fails to correctly recognize authorization settings due to variations in character casing. In many software systems, string comparisons are expected to be case-insensitive for configuration keys or boolean flags that control security features. However, when this expectation is not met, the validation routine may incorrectly interpret a valid enablement command as invalid or unrecognized. Consequently, instead of activating the authentication and authorization subsystems as intended by the administrator, the server defaults to a state where these protections are disabled. This represents a fundamental failure in input sanitization and configuration parsing logic, allowing the security control mechanism to be bypassed silently without generating an error that would alert the operator to misconfiguration.
From a technical perspective, this flaw aligns with CWE-20 Improper Input Validation, as the system does not adequately normalize or validate user-supplied configuration data before processing it for critical security decisions. The operational impact is severe because MongoDB deployments often expose database ports directly to networks where unauthenticated access might be possible if authentication is disabled by default or misconfigured. When authorization remains in a default disabled state due to this case-sensitivity bug, any entity with network connectivity to the affected server can interact with the database without providing credentials. This effectively removes all layers of identity verification and permission checking that MongoDB provides through its role-based access control system. The attacker does not need to exploit complex memory corruption or injection techniques; they simply connect to the open port and execute commands, leveraging the fact that the security gatekeeper is non-functional due to a simple configuration parsing error.
The consequences of this vulnerability extend across all three pillars of information security: confidentiality, integrity, and availability. Regarding confidentiality, an unauthenticated attacker can read sensitive data stored in any database accessible by the server, including personally identifiable information, financial records, or proprietary intellectual property. For integrity, the attacker possesses full administrative privileges, allowing them to modify, delete, or inject malicious documents into collections, thereby corrupting the trustworthiness of the entire dataset. In terms of availability, while MongoDB itself may remain operational, an attacker could drop critical databases or tables, rendering services dependent on that data unavailable. Furthermore, this level of access often serves as a foothold for lateral movement within an organization’s network, potentially leading to broader system compromise beyond just the database layer.
This scenario is closely mapped to MITRE ATT&CK techniques involving Initial Access and Privilege Escalation, specifically those related to exploiting misconfigured services or default credentials. Although this is not strictly a credential stuffing attack, it falls under the umbrella of leveraging improper authentication configurations to gain unauthorized access. The lack of proper validation allows an attacker to bypass the intended security architecture entirely, treating the database as if no security controls were ever implemented. This highlights the importance of rigorous testing for configuration parsers, ensuring that logical operators and string comparisons are robust against variations in input formatting such as case differences.
To mitigate this risk, organizations must ensure they are running a patched version of MongoDB Server where this validation logic has been corrected to handle case-insensitive comparison properly. Administrators should also implement defense-in-depth strategies by configuring firewalls to restrict access to database ports only from trusted application servers or specific IP ranges, thereby reducing the attack surface even if configuration errors occur. Additionally, regular audits of deployment configurations and automated testing pipelines that verify security settings are active post-deployment can help detect such misconfigurations early. It is crucial for development teams to adopt secure coding practices that enforce strict validation rules on all configuration inputs, particularly those governing authentication and authorization mechanisms, to prevent similar bypasses in future versions or other software components.