“Supabase Service Role Key Exposed to the Client” is a critical security issue that shows up in Supabase projects. It is one of the 125+ checks NexusBro runs on every audit — the kind of problem that is easy to miss in code review yet cheap to fix once you know exactly what to look for.
Left unaddressed, it widens your attack surface and can expose data, credentials, or admin access. The good news: this is a well-understood pattern with a deterministic check and a concrete fix, both of which are below. You can verify it by hand using the command shown, or let an automated scan find every instance of it across your whole site in one pass.
NexusBro checks for this automatically during a Supabase audit. To verify it yourself, run the check below and apply the fix it describes:
Verify service role key not exposed to client: grep -rn 'service_role\|SUPABASE_SERVICE_ROLE' src/ --include="*.tsx" --include="*.ts" | grep -v 'server\|api\|route\|middleware'. Service role bypasses RLS — must never be in client code.
Security findings are the ones worth fixing first. Attackers scan for exactly these patterns at scale, and a single exposed key or unprotected route can compromise everything behind it. The fix is almost always a small, well-scoped change — the hard part is knowing it is there, which is what an automated audit is for.
NexusBro audits your whole site for this check and 120+ others across performance, SEO, accessibility, and security, then hands you a copy-paste fix prompt for your AI coding tool. Free for your first scan, no signup required.
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