The prod CSP emitted script-src 'strict-dynamic' with no nonce seed,
blocking every Payload admin script (A8). Reuse the shared nonce-based
withSecurityHeaders: Payload admin pages are always dynamically
rendered, so Next propagates the nonce read from the forwarded
request's CSP header onto the admin's scripts.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Add Next.js middleware.ts to apps/cms that applies all six security
headers on every response using the framework-agnostic
buildSecurityHeaders builder. No nonce is generated or forwarded —
the CMS is server-side only so CSP nonces are not required.
Includes a test suite mirroring the web-next pattern that asserts all
six headers are set, no x-nonce is emitted, and CSP mode switches
correctly between dev (unsafe-inline) and prod (strict-dynamic).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
