Quick Answer
Parameter tampering is the correct choice because the hidden form field named 'price' stores client-side data that can be easily modified before submission. This attack exploits the lack of server-side validation, allowing an attacker to intercept the HTTP request using a proxy like Burp Suite and change the price parameter to a lower value, thereby purchasing the item at a reduced cost. On the Certified Ethical Hacker CEH exam, this scenario tests your understanding of web application vulnerabilities and the importance of never trusting client-supplied data, especially for sensitive values like pricing. A common trap is confusing parameter tampering with SQL injection or XSS, but remember that the core issue here is manipulating a hidden field’s value, not injecting code. Memory tip: “Hidden fields are not hidden from tampering—always validate server-side.”
This CEH practice question tests your understanding of network and web application attacks. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are performing a web application security assessment and discover that the application uses a hidden form field named 'price' to store the product price. The price is submitted with the form and used to process payments. Which attack would allow you to purchase an item for a lower price?
Directory traversal
Why wrong: Directory traversal accesses files, not form parameters.
Parameter tampering
Parameter tampering modifies hidden fields or URL parameters.
Cross-Site Scripting (XSS)
Why wrong: XSS injects scripts, not modifies form values.
Cross-Site Request Forgery (CSRF)
Why wrong: CSRF makes unauthorized requests, but does not modify the price.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Parameter tampering
Parameter tampering is the correct answer because the 'price' field is stored in a hidden form field, which is client-side data that can be modified before submission. By intercepting the HTTP request (e.g., using a proxy like Burp Suite) and changing the 'price' value to a lower amount, the attacker can purchase the item at a reduced cost. This exploits the lack of server-side validation of the price parameter.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Directory traversal
Why it's wrong here
Directory traversal accesses files, not form parameters.
Parameter tampering
Why this is correct
Parameter tampering modifies hidden fields or URL parameters.
Related concept
Read the scenario before looking for a memorised answer.
Cross-Site Scripting (XSS)
Why it's wrong here
XSS injects scripts, not modifies form values.
Cross-Site Request Forgery (CSRF)
Why it's wrong here
CSRF makes unauthorized requests, but does not modify the price.
Common exam traps
The trap here is that candidates often confuse parameter tampering with CSRF, but CSRF does not allow modifying the request body; it only reuses existing parameters from a forged request, whereas parameter tampering directly alters the parameter value.
Detailed technical explanation
Under the hood, hidden form fields are stored in the HTML DOM as <input type='hidden'> and are submitted as part of the HTTP POST body. Tools like Burp Suite's Repeater or a simple browser extension can intercept and modify the POST request before it reaches the server. In a real-world scenario, this vulnerability is common in e-commerce applications where price validation is only performed client-side via JavaScript, and the server blindly trusts the submitted value, leading to financial loss.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CEH exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Network and Web Application Attacks — This question tests Network and Web Application Attacks — Read the scenario before looking for a memorised answer..
The correct answer is: Parameter tampering — Parameter tampering is the correct answer because the 'price' field is stored in a hidden form field, which is client-side data that can be modified before submission. By intercepting the HTTP request (e.g., using a proxy like Burp Suite) and changing the 'price' value to a lower amount, the attacker can purchase the item at a reduced cost. This exploits the lack of server-side validation of the price parameter.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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