Quick Answer
The correct answer is to reset compromised credentials and revoke active sessions, combined with searching for mailbox rules or OAuth grants created after the compromise. These two actions directly address the core containment need in a phishing credential theft incident: immediately cutting off the attacker’s access while identifying any persistence mechanisms they may have established. Resetting passwords and revoking tokens—using tools like Azure AD’s Revoke-AzureADUserAllRefreshToken or Active Directory’s Reset-ADAccountPassword—invalidates session cookies and access tokens, preventing lateral movement or data exfiltration per the NIST SP 800-61 containment phase. On the CySA+ CS0-003 exam, this scenario tests your ability to prioritize containment over eradication, with a common trap being to focus solely on password resets while ignoring the attacker’s hidden mailbox rules or OAuth grants. Remember the mnemonic “Reset and Review”: reset credentials and review for unauthorized rules or grants to fully contain the threat.
This CS0-003 practice question tests your understanding of incident response and management. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 phishing incident led to credential theft. Which containment actions are appropriate? (Choose two.)
Reset affected credentials and revoke active sessions
This cuts off stolen-session and password access.
Delete all user mailboxes
Why wrong: This destroys business data and evidence.
Disable DNS for the entire company indefinitely
Why wrong: Broad DNS shutdown is disproportionate and disruptive.
Search for mailbox rules or OAuth grants created after compromise
Attackers often create persistence in mailbox or app permissions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Reset affected credentials and revoke active sessions
Option A is correct because immediately resetting compromised credentials and revoking active sessions (e.g., via Azure AD 'Revoke-AzureADUserAllRefreshToken' or Active Directory 'Reset-ADAccountPassword' combined with 'Revoke-AuthenticationTokens') invalidates the attacker's access tokens and session cookies, preventing further lateral movement or data exfiltration. This aligns with the NIST SP 800-61 containment phase, which prioritizes cutting off attacker access while preserving forensic evidence.
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.
Reset affected credentials and revoke active sessions
Why this is correct
This cuts off stolen-session and password access.
Related concept
Read the scenario before looking for a memorised answer.
Delete all user mailboxes
Why it's wrong here
This destroys business data and evidence.
Disable DNS for the entire company indefinitely
Why it's wrong here
Broad DNS shutdown is disproportionate and disruptive.
Search for mailbox rules or OAuth grants created after compromise
Why this is correct
Attackers often create persistence in mailbox or app permissions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the distinction between 'containment' (stopping the attack) and 'eradication' (removing the root cause), and the trap here is that candidates may choose overly aggressive actions like deleting mailboxes or disabling DNS, mistaking brute-force disruption for precise containment.
Detailed technical explanation
Under the hood, credential theft often leads to token-based attacks (e.g., OAuth 2.0 refresh tokens or Kerberos TGTs) that persist even after password changes. Revoking sessions requires invalidating all issued tokens via the identity provider's token revocation endpoint (RFC 7009) or clearing Kerberos ticket caches on domain controllers. In a real-world scenario, attackers may use stolen credentials to register MFA devices or create service principals; thus, a full credential reset must be paired with a review of authentication methods and privileged role assignments.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An employee at a financial services firm receives an email that appears to come from the IT helpdesk, asking them to reset their password via a link. The link leads to a convincing fake portal that harvests credentials. Security teams use phishing simulations and security-awareness training to reduce this attack vector. Questions like this test whether you can identify social engineering techniques and appropriate controls.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Incident Response and Management — study guide chapter
Learn the concepts, then practise the questions
Incident Response and Management practice questions
Targeted practice on this topic area only
All CS0-003 questions
503 questions across all exam domains
CompTIA CySA+ CS0-003 study guide
Full concept coverage aligned to exam objectives
CS0-003 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Practise CS0-003 questions linked to Security Operations.
Practise CS0-003 questions linked to Vulnerability Management.
Practise CS0-003 questions linked to Incident Response and Management.
Practise CS0-003 questions linked to Reporting and Communication.
Practise CS0-003 questions linked to CompTIA A+ hardware.
Practise CS0-003 questions linked to CompTIA A+ mobile devices.
Practise CS0-003 questions linked to CompTIA A+ networking.
Practise CS0-003 questions linked to CompTIA A+ operating systems.
Practise CS0-003 questions linked to CompTIA A+ security.
Practise CS0-003 questions linked to CompTIA A+ software troubleshooting questions.
Practise CS0-003 questions linked to CompTIA A+ operational procedures questions.
Practice this exam
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
The correct answer is: Reset affected credentials and revoke active sessions — Option A is correct because immediately resetting compromised credentials and revoking active sessions (e.g., via Azure AD 'Revoke-AzureADUserAllRefreshToken' or Active Directory 'Reset-ADAccountPassword' combined with 'Revoke-AuthenticationTokens') invalidates the attacker's access tokens and session cookies, preventing further lateral movement or data exfiltration. This aligns with the NIST SP 800-61 containment phase, which prioritizes cutting off attacker access while preserving forensic evidence.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.