ISC Practice Question: Systems Security Implementation Verification And Validation
During a penetration test of a web application, you identify an insecure direct object reference (IDOR). What is the most effective way to verify that your remediation via access control checks is successful?
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
✓
Execute automated authorization testing using a tool like Burp Suite Intruder to verify that non-authorized users receive a 403 Forbidden response.
Regression testing ensures that the fix addresses the vulnerability without breaking functionality.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Review the source code to ensure that the developer used a random UUID instead of sequential integers.
Why it's wrong here
Obfuscation is not a substitute for proper authorization verification.
- ✗
Run a vulnerability scanner to check for OWASP Top 10 compliance.
Why it's wrong here
Automated scanners often fail to detect complex authorization flaws without specific context.
- ✓
Execute automated authorization testing using a tool like Burp Suite Intruder to verify that non-authorized users receive a 403 Forbidden response.
Why this is correct
Intruder can be configured to iterate through object IDs while authenticated as different users to confirm access control enforcement.
- ✗
Perform a manual cross-site scripting (XSS) payload injection to confirm input sanitization.
Why it's wrong here
XSS testing is unrelated to IDOR vulnerabilities.
About these practice questions
This ISC question is part of Courseiva's 209-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.