- Open redirect / client-side XSS (app-base.js): the post-login `redirect`
read from the URL fragment was assigned straight to window.location. Add a
same-origin guard (safeInternalPath) that rejects absolute URLs,
protocol-relative "//host"/"/\\host", and scheme targets like
"javascript:". Apply it in consumeTokenFragment and logInRedirect.
- Server-side defense in depth: sanitize `redirect` when storing OidcState
and when building the callback fragment (utils/safe_redirect.js, shared +
unit-tested).
- Missing rate limiting: throttle the unauthenticated auth endpoints
(/login, /oidc/start, /oidc/callback) with express-rate-limit (60/IP/15m).
Set `trust proxy: 1` so req.ip reflects the real client behind OpenResty.
Adds test/unit/safe_redirect.test.js; unit suite 77 pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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