TerriaJS-Server has a domain validation bypass vulnerability in its proxy allowlist
A validation bug allows an attacker to proxy domains not explicitly allowed in the proxyableDomains configuration. The validation only checks if a hostname ended with an allowed domain. This meant: If example.com is allowed in proxyableDomains: ✅ example.com is allowed (correct) ✅ api.example.com is allowed (correct) ⚠️ maliciousexample.com is allowed (incorrect) An attacker could register maliciousexample.com and proxy content through terriajs-server, bypassing proxy restrictions.