Security checks / Check reference / Users & accounts
User High Risk User
Critical Severity Microsoft 365 security check in the Users & accounts domain.
User flagged as high risk by Entra ID Protection. Immediate investigation required High-confidence account compromise allows adversaries to operate as a legitimate user, enabling AiTM (adversary-in-the-middle) phishing, session cookie theft, and internal BEC (Business Email Compromise) Siemserva runs this check automatically across your tenant and maps every finding to the compliance frameworks below.
Check summary
What this check verifies
User flagged as high risk by Entra ID Protection. Immediate investigation required
Why it matters
High-confidence account compromise allows adversaries to operate as a legitimate user, enabling AiTM (adversary-in-the-middle) phishing, session cookie theft, and internal BEC (Business Email Compromise)
How to fix it
Entra admin center → Protection → Identity Protection → Risky users; select the user; click 'Confirm user compromised' to block sign-in and force a secure password reset; then revoke all active sessions (Entra admin center → Users → [user] → Revoke sessions); review recent sign-ins and audit logs for lateral movement
Siemserva flags every tenant where this check fails and, with Senserva Trustworthy AI remediation, can propose a validated fix you approve before it applies.
Ask your own AI about this check
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Compliance framework mappings
Findings from this check serve as evidence for:
References
Related Users & accounts checks
Related Entra ID guides
This is an Entra ID and identity check. See the broader guidance and the exact checks Siemserva runs in this area:
Common questions
What does the User High Risk User check verify?
User flagged as high risk by Entra ID Protection. Immediate investigation required It is a Critical Severity check in the Users & accounts domain, one of the 650+ checks Siemserva runs across Microsoft 365, Intune, Defender, and Entra ID.
How do I fix a User High Risk User finding?
Entra admin center → Protection → Identity Protection → Risky users; select the user; click 'Confirm user compromised' to block sign-in and force a secure password reset; then revoke all active sessions (Entra admin center → Users → [user] → Revoke sessions); review recent sign-ins and audit logs for lateral movement Siemserva ranks the finding by Severity and, with Senserva Trustworthy AI, can propose a validated, approve-before-apply configuration fix.
Which compliance frameworks does this check evidence?
Findings from this check map to SCuBA, MCSB, NIST, SOC2, CIS, HIPAA, including SCuBA policy MS.AAD.6.1v1, and MCSB controls LT-3, IM-6. That mapping is what turns a scan finding into audit evidence.
Can I ask my own AI about this check?
Yes. This page includes a free copy-paste AI prompt carrying the check's facts: what it verifies, the risk, the remediation, and the framework mappings. Paste it into Claude, ChatGPT, or Copilot; cite-worthy detail without giving an AI access to your tenant.
All 672 checks with severities and mappings: the Microsoft 365 security checks catalog.