Why are identical visible login messages insufficient to prevent enumeration?
Other observable differences, including status behavior or avoidable response-time differences, may still distinguish account states. Review the entire response path rather than only the displayed text.
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More FAQs in Why should login errors avoid revealing whether an account exists?
Yes. Format validation describes the user's input and does not require disclosing whether the account exists. Keep account lookup failures consistent across valid-looking addresses.
Use a consistent response explaining that eligible accounts will receive instructions. Provide useful next steps without publicly confirming whether the supplied address belongs to an account.
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