212-89 Web Application Incidents Practice Question
When analyzing an XSS attack, you find that the payload is being injected through a hidden form field. Which WAF policy is best suited to block this?
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
✓
Implement strict field-level input validation for the specific hidden form parameter
WAFs with 'Input Validation' or 'Request Body Inspection' can be configured to enforce strict rules on specific form fields, including hidden ones.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Implement strict field-level input validation for the specific hidden form parameter
Why this is correct
Restricting the allowed content for the specific hidden field mitigates the risk while allowing other traffic.
- ✗
Enable IP reputation blocking
Why it's wrong here
IP reputation is broad and does not address the specific payload injection.
- ✗
Enable URL encoding normalization
Why it's wrong here
This helps prevent bypasses but does not block the payload itself.
- ✗
Set the WAF to block all POST requests
Why it's wrong here
This would break application functionality entirely.
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 EC-Council exam blueprint
This 212-89 practice question is part of Courseiva's free EC-Council 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 212-89 exam.