Quick Answer
The answer is reflected cross-site scripting (XSS). This is correct because the vulnerability directly matches the definition of reflected XSS: user input is taken from a request (typically via a URL parameter or form field) and immediately included in the HTTP response without any sanitization or encoding, allowing an attacker to inject a malicious script that executes in the victim’s browser. On the CompTIA PenTest+ PT0-002 exam, this scenario tests your ability to distinguish reflected XSS from stored XSS or DOM-based XSS—a common trap is confusing it with stored XSS, but remember that reflected XSS is non-persistent and requires the victim to click a crafted link. A helpful memory tip: think of “reflected” as a mirror—the input bounces right back in the response, so if it’s not sanitized, the script fires immediately.
This PT0-002 practice question tests your understanding of attacks and exploits. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
During a penetration test, a tester discovers a web application that reflects user input in the HTTP response without sanitization. Which attack is most likely to be successful?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Server-side request forgery
Why wrong: SSRF makes server fetch resources, not reflect input.
SQL injection
Why wrong: SQL injection requires database queries, not just reflection.
Reflected cross-site scripting
Reflected XSS occurs when user input is echoed back unsanitized.
Cross-site request forgery
Why wrong: CSRF exploits state-changing requests, not reflected input.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Reflected cross-site scripting
Reflected cross-site scripting (XSS) is the correct answer because the vulnerability described—user input reflected in the HTTP response without sanitization—directly enables an attacker to inject malicious scripts (e.g., JavaScript) that execute in the victim's browser. This occurs when the application fails to validate or encode the input before including it in the response, allowing the attacker to craft a URL with a script payload that, when visited, runs in the context of the vulnerable web application's origin.
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.
Server-side request forgery
Why it's wrong here
SSRF makes server fetch resources, not reflect input.
SQL injection
Why it's wrong here
SQL injection requires database queries, not just reflection.
Reflected cross-site scripting
Why this is correct
Reflected XSS occurs when user input is echoed back unsanitized.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Cross-site request forgery
Why it's wrong here
CSRF exploits state-changing requests, not reflected input.
Common exam traps
The trap here is that candidates often confuse reflected XSS with stored XSS or CSRF, but the key differentiator is that the input is immediately reflected in the response without sanitization, not stored on the server or requiring a forged request.
Detailed technical explanation
Reflected XSS typically exploits GET parameters or URL fragments that are echoed back in the HTTP response body without proper encoding (e.g., HTML entity encoding of < and >). In a real-world scenario, an attacker might embed a payload like <script>alert(document.cookie)</script> in a search query parameter, and when the victim clicks a crafted link, the script executes, stealing session cookies or performing actions on behalf of the user. The attack succeeds because the browser trusts the origin of the script, as it is served from the vulnerable application's domain.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Attacks and Exploits — study guide chapter
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FAQ
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
The correct answer is: Reflected cross-site scripting — Reflected cross-site scripting (XSS) is the correct answer because the vulnerability described—user input reflected in the HTTP response without sanitization—directly enables an attacker to inject malicious scripts (e.g., JavaScript) that execute in the victim's browser. This occurs when the application fails to validate or encode the input before including it in the response, allowing the attacker to craft a URL with a script payload that, when visited, runs in the context of the vulnerable web application's origin.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. During a penetration test, a tester discovers a web application that reflects user input in the HTTP response without proper escaping or encoding. The input is not sanitized and is included in the page's HTML. Which type of vulnerability is most likely present?
easyWhy B: The vulnerability is reflected Cross-Site Scripting (XSS) because the web application immediately echoes user-supplied input in the HTTP response without proper escaping or encoding, allowing an attacker to inject arbitrary HTML or JavaScript that executes in the victim's browser. This matches the classic definition of reflected XSS, where the payload is part of the request and reflected back, not stored on the server.
Last reviewed: Jun 25, 2026
This PT0-002 practice question is part of Courseiva's free CompTIA 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 PT0-002 exam.
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