CVE-2026-121455 in DbGate
Summary
by MITRE • 11/03/2026
DbGate before 7.3.3 contains a missing authorization vulnerability that allows connection-restricted authenticated users to bypass LOGIN_PERMISSIONS because test() and save() never call testConnectionPermission. Attackers can submit arbitrary connection definitions to POST /connections/test to probe internal database hosts, or to /connections/save to overwrite stored connections.
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Analysis
by VulDB Data Team • 11/03/2026
DbGate versions prior to 7.3.3 suffer from a critical missing authorization vulnerability that fundamentally undermines the application's access control model for authenticated users who are subject to connection restrictions. The core technical flaw lies in the implementation of two specific API endpoints, POST /connections/test and POST /connections/save, which fail to invoke the testConnectionPermission function before processing requests. In a properly secured system, any operation involving database connections should verify that the requesting user has explicit permission for the target resource or action. However, because these functions bypass this essential security check, they allow connection-restricted authenticated users to execute actions that are explicitly forbidden by their assigned role policies. This represents a classic case of broken access control where the enforcement mechanism is absent rather than flawed in logic.
The operational impact of this vulnerability is significant and multifaceted. Attackers who have obtained valid credentials for an account with limited privileges can exploit these endpoints to probe internal database hosts that are not supposed to be accessible to them. By submitting arbitrary connection definitions through the test endpoint, adversaries can perform network reconnaissance against backend infrastructure, identifying live services, open ports, and potentially vulnerable database instances within the organization's private network. This capability effectively turns a low-privileged user account into a pivot point for further lateral movement or data exfiltration attempts. Furthermore, the save endpoint allows attackers to overwrite stored connection configurations. While this may not immediately lead to direct data theft depending on subsequent actions, it can be used to manipulate application behavior, redirect queries to malicious servers controlled by the attacker, or disrupt service availability by corrupting valid database connectivity settings.
This vulnerability aligns with CWE-284 Improper Access Control and falls under MITRE ATT&CK technique T1078 Valid Accounts, as exploitation requires initial authentication but leverages insufficient authorization checks on specific resources. The lack of permission verification for connection-related operations violates the principle of least privilege, allowing users to perform actions beyond their designated scope. To mitigate this risk, organizations must immediately upgrade DbGate to version 7.3.3 or later where these endpoints have been patched to correctly enforce access controls. In environments where upgrading is not immediately feasible, network segmentation should be reviewed to ensure that database hosts are not directly accessible from the web server tier without additional authentication layers. Additionally, implementing strict input validation and monitoring for unusual connection test requests can help detect exploitation attempts in real-time until a permanent fix is deployed.