CAS-004 Security Architecture Practice Question
During a threat modeling exercise for a new web application, the team identifies that the application uses JWT for authentication. Which vulnerability is most likely if the server does not properly verify the JWT signature?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
JWT tampering
If signature verification is missing, an attacker can forge a JWT with arbitrary payload (e.g., admin role).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cross-site scripting
Why it's wrong here
Incorrect; XSS is a different vulnerability.
- ✗
SQL injection
Why it's wrong here
Incorrect; not related to JWT signature verification.
- ✓
JWT tampering
Why this is correct
Correct; missing signature verification allows tampering with the JWT payload.
- ✗
Insecure direct object reference
Why it's wrong here
Incorrect; IDOR is about accessing unauthorized objects.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 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 CAS-005 exam.