ISC Practice Question: Systems Security Implementation Verification And Validation
You are validating the security of a web service using OAuth 2.0. Which specific verification step ensures that the authorization code is not leaked?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify that the redirect_uri is strictly validated against a whitelist on the authorization server.
Validation of OAuth requires ensuring that the redirect URI and other parameters are strictly handled.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Check the HTTP header for 'X-Frame-Options'.
Why it's wrong here
This helps prevent clickjacking, not authorization code leakage.
- ✓
Verify that the redirect_uri is strictly validated against a whitelist on the authorization server.
Why this is correct
Validating the redirect URI prevents authorization codes from being sent to malicious endpoints.
- ✗
Verify that the client secret is stored in the database.
Why it's wrong here
Client secrets should be stored in secure vaults, not application databases.
- ✗
Ensure the application uses HTTPS.
Why it's wrong here
HTTPS is required for transit, but it doesn't prevent application-level logic flaws like redirect URI manipulation.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official (ISC)² exam blueprint
This ISC practice question is part of Courseiva's free (ISC)² certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ISC exam.