Budibase: Unvalidated VectorDB Host Parameter Enables SSRF
Date: 2026-06
Affected: npm/@budibase/server
Attack vector: ssrf
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-48148
CWE: CWE-918

### Summary The VectorDB configuration endpoint in Budibase accepts a host parameter that undergoes no validation against internal IP ranges, reserved hostnames, or URL schemes. Any authenticated user with builder-level access can supply an arbitrary host value such as `169.254.169.254` or localhost, causing the server to initiate outbound TCP connections to internal network addresses or cloud metadata endpoints on their behalf. ### Details The validator responsible for VectorDB creation and updates defines the host field as `Joi.string().required()`, which enforces only that the value is a non-empty string. No allowlist of external hostnames, no blocklist of RFC 1918 or link-local ranges, and no scheme validation are applied before the value is forwarded to the database SDK for connection establishment. When a VectorDB entry is created or updated, the SDK uses the supplied host directly to open a TCP connection. Because the connection attempt originates from the Budibase server process, it traverses internal network boundaries that would otherwise be inaccessible to the attacker. Differences in connection timing and error messages between reachable and unreachable hosts allow an attacker to enumerate internal services and determine whether specific addresses are live. In cloud environments, the AWS EC2 metadata service at `169.254.169.254`, the GCP metadata server at `metadata.google.internal`, and equivalent endpoints for other providers are all reachable this way. Bui


Mitigations:

Architectural layers (MAESTRO):