The correct answer is to validate the Issuer element in the SAML response. This critical configuration step prevents SAML session hijacking by ensuring that the authentication assertion originated from the trusted on-premises identity provider (IdP) and not from an attacker who has forged a response with a manipulated Issuer value. Without this validation, an adversary could impersonate the IdP, inject a fraudulent SAML assertion, and hijack an active user session to gain unauthorized access to cloud applications. On the CISSP exam, this concept tests your understanding of federated identity security controls within the Identity and Access Management domain; a common trap is assuming that encryption alone suffices, but Issuer validation is a separate, mandatory check per the SAML 2.0 core specification. Remember the memory tip: “Trust the source, not just the token”—always verify the Issuer to block session hijacking.
CISSP Identity and Access Management Practice Question
This CISSP practice question tests your understanding of identity and access management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is implementing single sign-on (SSO) for its cloud applications. The security team wants to ensure that user authentication is handled by an on-premises identity provider (IdP) using Security Assertion Markup Language (SAML). Which of the following is a critical configuration step to prevent session hijacking?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Validate the Issuer element in the SAML response.
Option D is correct because validating the Issuer element in the SAML response ensures that the response originated from the trusted on-premises identity provider (IdP) and not from an attacker impersonating the IdP. Without this validation, an attacker could forge a SAML response with a manipulated Issuer value, leading to session hijacking or unauthorized access. This is a fundamental SAML security check specified in the SAML 2.0 core specification (section 3.3.4).
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.
✗
Use HTTP POST binding instead of HTTP Redirect binding.
Why it's wrong here
Binding affects transport but does not prevent session hijacking.
✗
Set a short timeout for the SAML authentication request.
Why it's wrong here
Timeout reduces the window but not a direct countermeasure.
✗
Encrypt the SAML assertions using the service provider's public key.
Why it's wrong here
Encryption protects confidentiality but does not prevent session hijacking.
✓
Validate the Issuer element in the SAML response.
Why this is correct
Ensures the response is from the trusted IdP, preventing impersonation.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse encryption (Option C) with authentication integrity, or focus on binding methods (Option A) or timeouts (Option B), missing that Issuer validation is the critical step to ensure the response comes from the legitimate IdP and prevent session hijacking.
Detailed technical explanation
How to think about this question
In SAML 2.0, the Issuer element is a required field in both AuthnRequest and Response messages, and its value must match the entity ID of the IdP that the service provider (SP) trusts. The SP typically maintains a list of trusted IdP entity IDs; failing to validate this allows an attacker to craft a SAML response with a different Issuer (e.g., a malicious IdP) and gain access. A real-world scenario is the 'SAML authentication bypass' vulnerability (CVE-2017-11427) where missing Issuer validation in some implementations allowed attackers to forge responses.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Identity and Access Management — This question tests Identity and Access Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Validate the Issuer element in the SAML response. — Option D is correct because validating the Issuer element in the SAML response ensures that the response originated from the trusted on-premises identity provider (IdP) and not from an attacker impersonating the IdP. Without this validation, an attacker could forge a SAML response with a manipulated Issuer value, leading to session hijacking or unauthorized access. This is a fundamental SAML security check specified in the SAML 2.0 core specification (section 3.3.4).
What should I do if I get this CISSP 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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