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ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question

Your team is designing a JSON/REST API for a multi-tenant SaaS platform. They propose including an API key as a query parameter in every request (e.g., /api/v1/resource?apikey=ABC123). As the security lead reviewing the protocol design, what primary security concern should you raise about this choice?

  • Browsers omit query parameters when transmitting HTTPS requests, breaking authentication that relies on them.

  • Query strings are often logged or leaked via browser history and Referer headers, exposing the API key to attackers.

  • Query parameters cannot exceed 32 characters, so the API key would lack sufficient entropy.

  • Using query parameters disables API gateway rate-limiting and throttling mechanisms.

ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Architecture and Design
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