Office 365 CIS Security Review

Strengthen Your Cloud Security with RedSecLabs. At RedSecLabs, we provide a comprehensive Office 365 CIS Security Review designed to align your Microsoft 365 environment with the Center for Internet Security (CIS) benchmarks, ensuring maximum protection against cyber threats and compliance risks.

While Office 365 ships with strong security features, most organisations fail to configure them properly, leaving critical gaps that attackers can exploit. Misconfigurations, weak authentication, and overlooked settings often become the root cause of breaches. Our CIS Security Review identifies these vulnerabilities and helps you implement security best practices recommended by CIS to safeguard your data, users, and applications.

Get Your Fixed-Fee Quote

Tell us what needs testing. You’ll get a scoped, fixed-fee quote back the same business day, from a senior assessor, not a sales rep. No obligation, no spam.

✓ Same-day response✓ Fixed-fee, no surprises✓ Senior testers only✓ Retest included

✓ UK-based CREST member · ✓ QSA-led methodology · ✓ Same-day scoping response · ✓ Executive + technical reports · ✓ Retest included

Why You Need an Office 365 CIS Security Review

Benefits of Choosing RedSecLabs

· Expertise in CIS Benchmarks

Our specialists ensure your Office 365 security aligns with global best practices.

Tailored Recommendations

We customise security improvements based on your organisation’s risk profile.

Proactive Defense

Reduce the likelihood of phishing, data breaches, and insider threats.

Compliance Readiness

Support for GDPR, ISO 27001, HIPAA, and other regulatory frameworks.

End-to-End Support

From assessment to implementation and monitoring, we ensure long-term resilience.

What We Deliver

Our Office 365 CIS Security Review covers all key security pillars, ensuring your Microsoft 365 environment is resilient and compliant:

Identity & Access Management

Enforce MFA, conditional access, and secure authentication policies.

Data Protection & Compliance

Review data loss prevention (DLP), encryption, and regulatory compliance controls.

Email & Collaboration Security

Secure Exchange Online, SharePoint, OneDrive, and Teams against phishing, spam, and unauthorized access.

Threat Detection & Response

Assess Microsoft Defender for Office 365, alerting mechanisms, and incident response readiness.

Configuration Gap Analysis

Compare your Office 365 settings with CIS benchmarks and identify areas of non-compliance.

Actionable Recommendations

Provide a prioritised remediation roadmap to strengthen your security posture.

Office 365 CIS Security Review Process

Scoping & Access Setup

Identify Office 365 tenants and required admin roles to enable read-only review.

Data Collection

Pull configurations from Exchange, SharePoint, Teams, OneDrive, and Azure AD using secure methods.

CIS Benchmark Mapping

Analyze configurations against CIS Level 1 & 2 controls for Microsoft 365 security hardening.

Findings & Risk Prioritization

Identify misconfigurations and prioritise them based on risk severity and business impact.

Reporting & Recommendations

Deliver a detailed report with compliance score, gap summary, and practical remediation steps.

Remediation Support (Optional)

Assist with implementing changes, configuring security policies, and enabling CIS-aligned protections.

Frequently asked questions

An Office 365 CIS Security Review assesses your Microsoft 365 environment against CIS (Center for Internet Security) benchmarks to identify security gaps and misconfigurations that could expose your organisation to risk.

CIS benchmarks are globally recognised security best practices. Following them helps reduce your attack surface and ensures a consistent, defensible security posture for your Office 365 tenant.

The review typically includes Exchange Online, SharePoint Online, Teams, OneDrive, Azure AD configurations, MFA enforcement, mailbox auditing, logging, and more,aligned to CIS Level 1 & 2 benchmarks.

Yes, Global Admin or Security Reader roles are typically required to access the necessary settings and perform a thorough review.

No. The review is non-intrusive and read-only. We only provide a detailed report and prioritised remediation plan. Actual changes are made with your consent and involvement if required.

We recommend conducting a CIS review annually or after any major Office 365 configuration changes, mergers, or onboarding of new users and services.

You’ll receive a detailed security assessment report, CIS compliance score, prioritised remediation roadmap, and best practice recommendations tailored to your environment.

No. The assessment is conducted passively using read-only access and does not interfere with normal operations or affect user access.

Get My Fixed-Fee Quote

Book a free 30-minute scoping call. CREST-format proposal within 48 hours, engagement starts within 1-2 weeks.

Book a Scoping Call Contact Us

What you receive

Every engagement includes

✓ Scoping call. A 30-minute call to define scope, timeline, and authorisation boundaries.
✓ Test plan. Written test plan covering targets, methodology, and rules of engagement.
✓ Technical report. Detailed findings with reproduction steps, evidence, and remediation guidance.
✓ Executive summary. Board-ready 1-2 page summary with risk ratings and business impact.
✓ Audit-ready evidence. Findings letter formatted for auditors, customers, and supervisory authorities.
✓ Retest letter. Free retest of remediated findings within an agreed window. Confirmation letter included.
✓ Remediation call. A call with our lead tester to walk through findings and remediation strategy.

How we deliver

Our process, end to end

1
Scoping call & fixed-scope quote

A 30-minute call. We define scope, targets, timeline. You get a fixed-scope quote within one working day. No surprise invoices.
2
Test plan & authorisation

Written test plan covering methodology, targets, and rules of engagement. Authorisation letter signed before any testing begins.
3
CREST-accredited execution

Senior tester runs the engagement. Critical findings flagged immediately during testing. Daily updates if you want them.
4
Technical + executive report

Detailed technical findings with reproduction steps. Board-ready executive summary. Delivered within agreed working days.
5
Remediation call & retest

Walkthrough with our lead tester. Retest of remediated findings within the agreed window. Confirmation letter for your auditors.

Engagement scope

What shapes the quote

Small scope

Single app, focused scope, smaller surface. 5-7 working days.

Medium scope

Multi-role platform, several user types, integrations. 8-12 working days.

Enterprise scope

Complex environment, multiple targets, compliance evidence. 12-25 working days.

Fixed-scope quote within 1 working day

No surprise invoices, no scope-creep. We commit to a number before you commit to us.

Sample report

See exactly what we deliver

Download a redacted RedSecLabs penetration test report. Same format, same depth, same clarity as the report your team will receive.

Download sample report

Why RedSecLabs

Grounded reasons clients choose us

⚑

UK-based team

Testers based in the UK. Data stays within UK/EU jurisdiction for sensitive engagements.

❄

CREST member company

CREST-accredited methodology. Senior testers hold CREST CRT or CCT certifications.

⚙

Manual testing, not scanner-only

Automated scanners catch the obvious. Our human testers find the issues that matter.

✎

Clear executive reporting

Reports your board can read and your developers can act on. No jargon padding.

♚

Compliance-aware delivery

PCI, SOC 2, ISO 27001, DORA, GDPR. We map findings to your compliance framework.

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Retest support included

Free retest of remediated findings within agreed window. Confirmation letter for auditors.

Related services

Often paired with this engagement

Configuration Review →

Cyber Essentials →

SOC 2 Compliance →

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