The answer is SQL injection. This is the correct choice because the described vulnerability—client-side JavaScript validation with no server-side sanitization—creates a direct path for an attacker to bypass client-side controls and inject malicious SQL syntax into a database query. When input is used directly in a SQL query without server-side validation, an attacker can disable JavaScript or intercept the request with a proxy like Burp Suite to submit crafted payloads such as `' OR 1=1 --`, manipulating the query to extract or alter data. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your understanding of how client-side validation bypass leads to SQL injection, a common trap where testers mistakenly focus on the client-side fix rather than the server-side flaw. Remember the memory tip: “Client-side checks are just suggestions; the real gate is server-side protections.”
PT0-002 Attacks and Exploits Practice Question
This PT0-002 practice question tests your understanding of attacks and exploits. 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.
A penetration tester discovers a web application that uses client-side JavaScript to validate user input before form submission. The input is then sent to the server and used directly in a SQL query without server-side validation. Which attack would most effectively exploit this vulnerability?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
SQL injection
The correct answer is A because the vulnerability described—client-side JavaScript validation with no server-side sanitization, followed by direct use of input in a SQL query—is the classic precondition for SQL injection. An attacker can bypass client-side controls (e.g., by disabling JavaScript or using a proxy like Burp Suite) and submit crafted SQL syntax (e.g., `' OR 1=1 --`) to manipulate the query, extract data, or execute arbitrary SQL commands on the database server.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
SQL injection
Why this is correct
Client-side validation is easily bypassed; by sending malicious SQL payloads directly to the server, the tester can manipulate the database query.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cross-site scripting (XSS)
Why it's wrong here
XSS targets users' browsers and does not typically exploit server-side database queries.
✗
Command injection
Why it's wrong here
Command injection requires the input to be passed to a system command interpreter, not a SQL query.
✗
Parameter pollution
Why it's wrong here
Parameter pollution manipulates HTTP parameters but does not directly exploit SQL queries.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse client-side validation bypass with XSS, thinking that JavaScript injection is the primary risk, but the key is that the input flows directly into a SQL query, making SQL injection the most effective and direct attack.
Trap categories for this question
Command / output trap
Command injection requires the input to be passed to a system command interpreter, not a SQL query.
Detailed technical explanation
How to think about this question
Under the hood, SQL injection exploits the lack of parameterized queries or prepared statements—when user input is concatenated directly into a SQL string, an attacker can break out of the intended syntax using quote characters and SQL operators. For example, submitting `' UNION SELECT username, password FROM users --` in a login form can return arbitrary table data. In real-world scenarios, tools like sqlmap automate detection and exploitation, and even blind SQL injection (e.g., time-based or boolean-based) can exfiltrate data when error messages are suppressed.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PT0-002 question in full detail.
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: SQL injection — The correct answer is A because the vulnerability described—client-side JavaScript validation with no server-side sanitization, followed by direct use of input in a SQL query—is the classic precondition for SQL injection. An attacker can bypass client-side controls (e.g., by disabling JavaScript or using a proxy like Burp Suite) and submit crafted SQL syntax (e.g., `' OR 1=1 --`) to manipulate the query, extract data, or execute arbitrary SQL commands on the database server.
What should I do if I get this PT0-002 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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