CVE-2026-54077: ArcadeDB: IMPORT DATABASE allows SSRF and arbitrary local file read by authenticated users

The SQL IMPORT DATABASE statement did not require administrative privileges and passed its source URL to the importer without validation. Any authenticated user with SQL command access (not only root/administrators) could therefore:

• Server-Side Request Forgery (CWE-918): cause the server to issue HTTP(S) requests to arbitrary destinations, including cloud metadata endpoints (e.g. 169.254.169.254) and internal-only services, and ingest the responses as queryable records.
• Arbitrary local file read (CWE-22): read local files reachable by the server process (e.g. /etc/passwd, credential files) by importing file:// paths, exposing their contents as records.

The server administration endpoint (/api/v1/server) was already restricted to the root user and was not affected; the exposure was through the database SQL command/query endpoints (/api/v1/command, /api/v1/query).

A related lower-severity hardening gap (CWE-776): the XML importer did not disable DTD processing, leaving entity-expansion (Billion Laughs) possible.