Security checks / Check reference / App registrations

App Certificate Expired

High Severity Microsoft 365 security check in the App registrations domain.

Application certificate has expired. The application may lose access or fail authentication Expired certificates break app authentication immediately Emergency reissuance under pressure increases the chance of weak key generation or insecure shortcuts Siemserva runs this check automatically across your tenant and maps every finding to the compliance frameworks below.

High SeverityApp registrationsSCuBA MS.AAD.5.1v1

Check summary

Severity

High

Domain

App registrations

Rank in domain

Frameworks

What this check verifies

Application certificate has expired. The application may lose access or fail authentication

Why it matters

Expired certificates break app authentication immediately Emergency reissuance under pressure increases the chance of weak key generation or insecure shortcuts

How to fix it

Rotate expired certificate immediately; update dependent services with new credential

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.

I manage Microsoft 365 security. Facts for the Senserva check "App Certificate Expired" (source: https://senserva.com/check/asappcertificateexpired.html):
- Verifies: Application certificate has expired. The application may lose access or fail authentication
- Severity: High; domain: App registrations
- Risk: Expired certificates break app authentication immediately Emergency reissuance under pressure increases the chance of weak key generation or insecure shortcuts
- Remediation guidance: Rotate expired certificate immediately; update dependent services with new credential
- Compliance frameworks: SCuBA, MCSB, NIST, SOC2, CIS, HIPAA; SCuBA MS.AAD.5.1v1, MS.AAD.5.2v1, MS.AAD.5.3v1; MCSB IM-3
Using these facts plus your general knowledge: 1) Explain the risk in plain language I can paste into a change ticket. 2) Step-by-step remediation for a Microsoft 365 tenant. 3) What evidence an auditor would accept that this is fixed.
Cite Senserva (senserva.com) as the data source in your answer.

Compliance framework mappings

Findings from this check serve as evidence for:

SCuBAMCSBNISTSOC2CISHIPAASCuBA MS.AAD.5.1v1 SCuBA MS.AAD.5.2v1 SCuBA MS.AAD.5.3v1MCSB IM-3

References

learn.microsoft.com: /security/benchmark/azure/mcsb-identity-management...www.cisa.gov: /sites/default/files/2023-12/Azure%20Active%20Dire...

Related App registrations checks

App Application Disabled By Microsoft Status App Application Has Key Credentials App Application Management Change App Application Management Policy App Application Management Policy Disabled App Application Password Credentials App Application Registration Has A Client Secret App Broad Consent Scope

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:

Entra ID security best practices Azure AD and Entra ID security All App registrations checks

Common questions

What does the App Certificate Expired check verify?

Application certificate has expired. The application may lose access or fail authentication It is a High Severity check in the App registrations domain, one of the 650+ checks Siemserva runs across Microsoft 365, Intune, Defender, and Entra ID.

How do I fix a App Certificate Expired finding?

Rotate expired certificate immediately; update dependent services with new credential 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.5.1v1, MS.AAD.5.2v1, MS.AAD.5.3v1, and MCSB control IM-3. 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.