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ISC2 Certified Secure Software Lifecycle Professional (CSSLP) Practice Question

During a peer review of a new RESTful service, you notice that input validation occurs only in browser-side JavaScript, which blacklists the characters < and >. According to secure coding best practices, which single modification would most directly strengthen this control against injection attacks?

  • Keep the blacklist but also use prepared statements for all database operations.

  • Validate every parameter on the server using an allow-list that enforces expected type, length, and format.

  • Move the existing blacklist logic into a shared client-side library used by all pages.

  • Surround any incoming data with HTML entity encoding before storing it in the database.

ISC2 Certified Secure Software Lifecycle Professional (CSSLP)
Secure Software Implementation
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