Security checks / Check reference / Conditional Access

Conditional Access Block Legacy Exchange Active Sync Found

Info Severity Microsoft 365 security check in the Conditional Access domain.

A Conditional Access policy blocking legacy Exchange ActiveSync authentication was found Some legacy Exchange ActiveSync flows still operate through exemptions; attackers target exempted identities for mailbox persistence Siemserva runs this check automatically across your tenant and maps every finding to the compliance frameworks below.

Info SeverityConditional AccessSCuBA MS.AAD.1.1v1

Check summary

Severity
Info
Domain
Conditional Access
Rank in domain
1
Frameworks
6

What this check verifies

A Conditional Access policy blocking legacy Exchange ActiveSync authentication was found

Why it matters

Some legacy Exchange ActiveSync flows still operate through exemptions; attackers target exempted identities for mailbox persistence

How to fix it

Maintain legacy protocol blocking; review scope for new protocols and monitor bypass attempts

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:

SCuBAMCSBNISTSOC2CISHIPAASCuBA MS.AAD.1.1v1SCuBA MS.AAD.2.1v1SCuBA MS.AAD.2.2v1SCuBA MS.AAD.2.3v1SCuBA MS.AAD.3.1v1SCuBA MS.AAD.3.2v1MCSB IM-6MCSB IM-7

References

learn.microsoft.com: /entra/identity/conditional-access/policy-block-le...learn.microsoft.com: /entra/identity/conditional-access/overview...learn.microsoft.com: /entra/identity/conditional-access/plan-conditiona...www.cisa.gov: /sites/default/files/2023-12/Azure%20Active%20Dire...

Related Conditional Access checks

Conditional Access Admin Portal Missing MFAConditional Access Block Legacy Exchange Active S...Conditional Access Block Requested PlatformsConditional Access Break Glass Account Covered By...Conditional Access Break Glass Account ExcludedConditional Access Browser O365 Missing MFAConditional Access Coverage GapConditional Access Critical Coverage Gap

Common questions

What does the Conditional Access Block Legacy Exchange Active Sync Found check verify?

A Conditional Access policy blocking legacy Exchange ActiveSync authentication was found It is a Info Severity check in the Conditional Access domain, one of the 650+ checks Siemserva runs across Microsoft 365, Intune, Defender, and Entra ID.

How do I fix a Conditional Access Block Legacy Exchange Active Sync Found finding?

Maintain legacy protocol blocking; review scope for new protocols and monitor bypass attempts 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.1.1v1, MS.AAD.2.1v1, MS.AAD.2.2v1, MS.AAD.2.3v1, MS.AAD.3.1v1, MS.AAD.3.2v1, and MCSB controls IM-6, IM-7. 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.

Sponsored by Senserva

Siemserva by Senserva runs this check, Conditional Access Block Legacy Exchange... for example, across your own tenant: which tenants pass, which fail, ranked by Severity with the evidence attached.

  • 650+ Microsoft 365, Intune, Defender, and Entra ID checks in one scan
  • Findings mapped to SCuBA, CIS, NIST, HIPAA, SOC 2, and MCSB for audit-ready evidence
  • Senserva Trustworthy AI driven configuration remediation: validated, approve-before-apply fixes
  • Optional AI Enhanced Reporting: plain-language summaries and recommended next steps written into your reports
  • Multi-tenant and MSP practices, with bulk tenant audits and client-ready reporting
Compliance Status Report
Conditional Access Block Legacy Exchange... across 2 tenants, ranked by Severity
23
FAILING
87
PASSING
41
OTHER FINDINGS
CHECKSEVERITYSTATUSFINDINGS
Conditional Access Block Legacy Exchange...InfoFAILING23
MFA for all usersCritical-11
Legacy authentication blockedHigh-6
Estimated report, sample data for illustration
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Reference: the compliance and audit guide, and the full checks catalog.
Data notice: check definitions describe what Siemserva verifies and are provided as is, for informational purposes only, without warranty of any kind. Framework mappings are informational and do not constitute compliance advice; confirm requirements with your assessor. All use of this data is subject to the Senserva EULA.