Angular SSR Security: allowedHosts, Host Header Validation, TransferState and Secrets Leaking into Bundles
In Angular SSR the server resolves relative HttpClient URLs against the incoming request's Host header, so fill allowedHosts with explicit names, trust proxy headers only behind a trusted proxy and do not derive the API address from Host. On a local SSR server we show SSRF, the 2026 advisories, fields leaking into TransferState, a nonce-based CSP under SSR and secrets ending up in bundles and source maps, all with real output.
8 Nov 2026
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16 min
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4
