The answer is unexpected pop-up windows in the browser, along with unexpected script execution in the developer console and altered webpage content that appears without user interaction. These are common indicators of a cross-site scripting (XSS) attack because XSS exploits inject malicious JavaScript into a trusted web application, which then executes in the victim’s browser. When the payload runs, it can trigger pop-ups, modify the DOM to display fake forms or messages, and leave traces in the browser’s developer console—all signs that an attacker’s script has been executed. On the Systems Security Certified Practitioner SSCP exam, this topic tests your ability to recognize attack symptoms versus benign behavior; a common trap is confusing XSS indicators with simple browser glitches or adware. Remember that XSS indicators always involve script-driven changes without user initiation. For a quick memory tip, think of the three U’s: Unexpected pop-ups, Unrequested console scripts, and Unauthorized page changes.
SSCP Systems and Application Security Practice Question
This SSCP practice question tests your understanding of systems and application security. 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.
Which THREE of the following are common indicators of a cross-site scripting (XSS) attack? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
JavaScript execution in the browser's developer console that was not initiated by the user
Option B is correct because XSS attacks often inject malicious JavaScript that executes in the victim's browser without user initiation. Observing unexpected script execution in the developer console indicates that an attacker's payload has run, which is a direct sign of a successful XSS exploit.
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.
✗
Unusual cookie values or multiple cookies
Why it's wrong here
May indicate session fixation or hijacking, not specifically XSS.
✓
JavaScript execution in the browser's developer console that was not initiated by the user
Why this is correct
XSS payloads often execute script automatically.
Related concept
Read the scenario before looking for a memorised answer.
✓
Presence of script tags in the page source that are not part of the original application
Why this is correct
Injected script tags are a hallmark of XSS.
Related concept
Read the scenario before looking for a memorised answer.
✓
Unexpected pop-up windows in the browser
Why this is correct
XSS can inject JavaScript that creates pop-ups.
Related concept
Read the scenario before looking for a memorised answer.
✗
Unusual network traffic to external IP addresses
Why it's wrong here
May be caused by other malware, not specifically XSS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the distinction between direct indicators of an attack (like unexpected script execution or script tags) and secondary consequences (like unusual network traffic or cookie anomalies), causing candidates to select options that are results of an attack rather than the attack itself.
Detailed technical explanation
How to think about this question
XSS attacks exploit the trust a browser has in a web application by injecting scripts into otherwise benign and trusted websites. The injected script executes in the same origin as the vulnerable application, allowing it to access cookies, session tokens, and other sensitive data via the Document Object Model (DOM). A real-world scenario is a stored XSS attack on a comment forum where an attacker posts a script that steals session cookies, and every user viewing the comment triggers the script, leading to account takeover.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Systems and Application Security — This question tests Systems and Application Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: JavaScript execution in the browser's developer console that was not initiated by the user — Option B is correct because XSS attacks often inject malicious JavaScript that executes in the victim's browser without user initiation. Observing unexpected script execution in the developer console indicates that an attacker's payload has run, which is a direct sign of a successful XSS exploit.
What should I do if I get this SSCP 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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