Quick Answer
The answer is identifying the vulnerable parameter and output encoding context. This confirms stored XSS exploitability because a stored cross-site scripting attack requires two conditions: the injected payload must be persistently saved on the server—such as in a database or log file—and the application must later render that payload in a browser without proper output encoding, allowing it to execute as code. On the CompTIA CySA+ CS0-003 exam, this question tests your ability to distinguish between a mere scan finding and a confirmed exploit; a common trap is assuming any stored input is automatically exploitable, but without verifying the output context—like whether HTML encoding is applied—the attack may fail. The key memory tip is "store and serve": stored XSS is only exploitable when the server both stores the payload and serves it unencoded to other users, proving the impact extends beyond the tester.
This CS0-003 practice question tests your understanding of vulnerability management. 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 web application DAST scan reports stored XSS. Which evidence helps confirm exploitability? (Choose two.)
Payload persists and executes when another user views the affected page
Stored execution against another user validates impact.
The vulnerable parameter and output encoding context are identified
Context shows why the payload executes.
The server has a large disk
Why wrong: Disk size is unrelated to XSS exploitability.
The application uses HTTPS
Why wrong: HTTPS protects transport but does not prevent XSS.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Payload persists and executes when another user views the affected page
Option A is correct because stored XSS is confirmed exploitable only when the injected payload (e.g., <script>alert(1)</script>) is persistently stored on the server (e.g., in a database or file) and then rendered and executed in the browser of another user who views the affected page. This demonstrates that the attack can impact victims beyond the tester, proving the vulnerability is not self-inflicted or limited to the attacker's session.
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.
Payload persists and executes when another user views the affected page
Why this is correct
Stored execution against another user validates impact.
Related concept
Read the scenario before looking for a memorised answer.
The vulnerable parameter and output encoding context are identified
Why this is correct
Context shows why the payload executes.
Related concept
Read the scenario before looking for a memorised answer.
The server has a large disk
Why it's wrong here
Disk size is unrelated to XSS exploitability.
The application uses HTTPS
Why it's wrong here
HTTPS protects transport but does not prevent XSS.
Common exam traps
Cisco often tests the distinction between identifying a vulnerability's context (Option B) and actually proving it is exploitable (Option A), leading candidates to confuse analysis steps with exploitation evidence.
Detailed technical explanation
Stored XSS (also called persistent XSS) occurs when user input is stored on the server (e.g., in a database, comment field, or log) and later served to other users without proper sanitization or encoding. The key difference from reflected XSS is that the payload remains active across sessions, making it more dangerous — a single injection can affect every visitor to the affected page. In a DAST scan, the tool typically injects a test payload and then checks if it appears in subsequent responses; manual verification of cross-user execution confirms the exploit path.
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
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FAQ
Vulnerability Management — This question tests Vulnerability Management — Read the scenario before looking for a memorised answer..
The correct answer is: Payload persists and executes when another user views the affected page — Option A is correct because stored XSS is confirmed exploitable only when the injected payload (e.g., <script>alert(1)</script>) is persistently stored on the server (e.g., in a database or file) and then rendered and executed in the browser of another user who views the affected page. This demonstrates that the attack can impact victims beyond the tester, proving the vulnerability is not self-inflicted or limited to the attacker's session.
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
This CS0-003 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 CS0-003 exam.
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