The authenticity_token can be reversed and used to forge valid per_form_csrf_tokens for arbitrary routes
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When `per_form_csrf_tokens` is set to `true`, each form should protected against CSRF with a unique token that is not predictable by an attacker. The`per_form_csrf_token` is generated using a HMAC SHA-256 using a key that is exposed in a reversed `authenticity_token`. The `authenticity_token` is a …
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