CVE-2026-6215: DbGate SSRF Vulnerability

CVE-2026-6215 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in DbGate, a popular open-source database management tool. The vulnerability exists in the apiServerUrl1 function within the file packages/rest/src/openApiDriver.ts of the REST/GraphQL component. This flaw allows attackers to manipulate server-side requests, potentially enabling access to internal services, data exfiltration, or further network reconnaissance from the vulnerable server's perspective.

Critical Impact

Authenticated remote attackers can exploit this SSRF vulnerability to make the DbGate server send crafted requests to arbitrary internal or external destinations, potentially bypassing network security controls and accessing sensitive internal resources.

Affected Products

• DbGate versions up to and including 7.1.4
• DbGate REST API component
• DbGate GraphQL component

Discovery Timeline

• 2026-04-13 - CVE-2026-6215 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-6215

Vulnerability Analysis

This Server-Side Request Forgery (SSRF) vulnerability (CWE-918) resides in the REST/GraphQL component of DbGate, specifically within the apiServerUrl1 function located in packages/rest/src/openApiDriver.ts. SSRF vulnerabilities occur when an application fetches remote resources based on user-supplied input without proper validation, allowing attackers to coerce the server into making requests to unintended locations.

In this case, the function responsible for handling API server URL configuration does not adequately validate or sanitize user-controlled input before using it to construct and execute server-side HTTP requests. An authenticated attacker with network access can exploit this weakness to redirect requests to internal services, cloud metadata endpoints, or external systems under attacker control.

Root Cause

The root cause of this vulnerability is insufficient input validation in the apiServerUrl1 function within the OpenAPI driver module. The function accepts URL parameters that are used to construct server-side requests without properly verifying that the target destination is within an expected allowlist or blocking access to sensitive internal addresses. This allows malicious actors to manipulate the URL parameter to point to arbitrary network locations.

Attack Vector

The attack is initiated remotely over the network and requires low-privilege authentication to exploit. An attacker can craft malicious requests to the REST/GraphQL endpoint that include manipulated URL parameters. When the vulnerable function processes these requests, it will make HTTP requests to attacker-specified destinations from the context of the DbGate server.

Common exploitation scenarios include:

• Accessing internal services not exposed to the public internet
• Querying cloud provider metadata services (e.g., AWS EC2 metadata at 169.254.169.254)
• Port scanning internal networks from the server's network position
• Exfiltrating sensitive data through DNS or HTTP channels
• Bypassing firewall rules that trust the DbGate server

The exploit has been publicly disclosed, and the vendor was contacted about this vulnerability but did not respond. For detailed technical information, refer to the VulDB Vulnerability Entry #357134.

Detection Methods for CVE-2026-6215

Indicators of Compromise

• Unusual outbound requests from the DbGate server to internal IP ranges (10.x.x.x, 172.16.x.x, 192.168.x.x)
• Requests to cloud metadata endpoints (169.254.169.254) originating from the application server
• Unexpected DNS queries or HTTP connections to external domains from the DbGate process
• Log entries showing REST/GraphQL API calls with suspicious URL parameters containing internal addresses

Detection Strategies

• Monitor network traffic from DbGate servers for connections to internal services that should not be accessed
• Implement egress filtering rules and alert on violations from application servers
• Review DbGate application logs for unusual API endpoint usage patterns, particularly those involving URL manipulation
• Deploy web application firewall (WAF) rules to detect and block SSRF payloads in request parameters

Monitoring Recommendations

• Enable detailed logging for all REST and GraphQL API requests in DbGate
• Implement network segmentation monitoring to detect lateral movement attempts via SSRF
• Set up alerts for outbound connections from DbGate to sensitive internal services or metadata endpoints
• Monitor for reconnaissance patterns such as sequential port scanning behavior originating from the server

How to Mitigate CVE-2026-6215

Immediate Actions Required

• Restrict network access to DbGate instances to only trusted users and networks
• Implement egress filtering on the DbGate server to limit outbound connections to known, required destinations
• Deploy a web application firewall (WAF) with SSRF protection rules in front of the DbGate REST/GraphQL endpoints
• Review and limit user permissions to reduce the attack surface for authenticated exploitation

Patch Information

As of the publication date, the vendor has not responded to disclosure attempts, and no official patch is available. Organizations should monitor the VulDB Vulnerability Entry and DbGate release notes for future security updates. Consider upgrading to versions newer than 7.1.4 once a fix is released.

Workarounds

• Implement strict network egress filtering to prevent the DbGate server from connecting to internal networks or sensitive endpoints
• Use a reverse proxy or API gateway to validate and sanitize URL parameters before they reach the DbGate application
• Block access to cloud metadata services (169.254.169.254) from the application server at the network level
• Consider disabling or restricting access to the REST/GraphQL component if not required for operations

# Example: Block access to internal networks and cloud metadata from DbGate server using iptables
# Block cloud metadata endpoint
iptables -A OUTPUT -m owner --uid-owner dbgate -d 169.254.169.254 -j DROP

# Block common internal network ranges
iptables -A OUTPUT -m owner --uid-owner dbgate -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -m owner --uid-owner dbgate -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -m owner --uid-owner dbgate -d 192.168.0.0/16 -j DROP

# Allow only specific required external destinations (customize as needed)
# iptables -A OUTPUT -m owner --uid-owner dbgate -d <allowed_ip> -j ACCEPT