Guide
Internal or staging URLs referenced in bundles
How StackSiren Deep Scan detects this issue and how to fix it. Severity typically low.
Why it matters
Internal or staging URLs referenced in bundles is a common finding on vibe-coded and AI-built apps that ship client bundles, shared backends or platform defaults without a security pass.
StackSiren reports this from read-only checks (GET, HEAD or OPTIONS only). It does not exploit the issue.
How to fix it
Remove references to localhost, staging, admin or internal hosts from production builds (use per-environment env vars). Make sure any referenced staging environment is protected by auth.
How StackSiren Deep Scan checks
Deep Scan runs only on hosts you have verified you own (DNS TXT or /.well-known file) and consented to test. Findings include a short evidence string; secret values are masked.
See the Acceptable Use Policy and Active scanning terms for what Deep Scan is and is not.