MFA And Conditional Access
MFA coverage, break-glass accounts, trusted locations, risky sign-in handling, device requirements, and legacy authentication exposure.
Microsoft 365 Audit
Microsoft 365 Security Audit for Accounting Firms
Most accounting-firm breaches begin with identity, email, unsafe sharing, or weak administrative controls. OC Security Audit reviews Microsoft 365 and Entra ID settings that protect taxpayer data, client files, payroll records, and executive communications.
CISO-Led25+ Years ExperienceIRS WISPFTC SafeguardsMicrosoft 365 Security
High-Value Target
Why Microsoft 365 Needs Accounting-Specific Review
CPA firms often depend on Outlook, SharePoint, OneDrive, Teams, and cloud document workflows to exchange tax organizers, W-2s, 1099s, bank information, payroll records, and client financial statements. Default settings are rarely enough for this level of sensitivity.
A Microsoft 365 security audit validates the controls that reduce account takeover, mailbox forwarding, unsafe external sharing, stale admin access, weak logging, and unmanaged device access.
Audit Scope
What OC Security Audit Reviews
Email Security
Anti-phishing, impersonation protection, mailbox forwarding, transport rules, quarantine policies, SPF/DKIM/DMARC alignment, and user reporting.
SharePoint And OneDrive
External sharing, anonymous links, guest access, sensitive file exposure, retention, versioning, and auditability of client documents.
Admin Roles
Global admins, privileged role sprawl, service accounts, stale accounts, emergency access, and role assignment evidence.
Logging And Alerts
Unified audit log, mailbox audit, sign-in logs, risky user alerts, Defender signals, and practical monitoring workflows.
Endpoint And Device Access
Device compliance, mobile access, unmanaged browser downloads, local encryption, and access from personal or seasonal worker devices.
Related Reviews
When Microsoft 365 Connects To Broader Risk
Microsoft 365 findings often connect to network vulnerability assessment, firewall and VPN review, IRS WISP readiness, and cyber insurance evidence.
For deeper platform review, see OC Security Audit’s Microsoft Office 365 Full Audit.
Evidence Output
Practical Deliverables For Firm Leadership And IT
Configuration Findings
A clear list of risky settings, affected users, administrative gaps, and recommended changes.
Priority Fix Plan
A sequenced plan for MFA, Conditional Access, sharing controls, email protection, logging, and admin cleanup.
Compliance Support
Evidence points that support WISP, FTC Safeguards, cyber insurance, and client security questionnaire responses.
Ali Hassani, CISO
Experienced Cybersecurity Guidance For Accounting Firms
Created by Ali Hassani, CISO, with 25+ years of IT, cybersecurity, compliance, Microsoft infrastructure, network security, firewall, cloud, and IT operations experience. Ali’s background includes CISSP, CCISO, CCNP, CCNA, MCSE, MCSA Security, MCITP, MCP, and MCTS credentials.
For accounting firms, the focus is practical: protect taxpayer data, reduce email and ransomware exposure, document evidence, and help leadership understand which security fixes matter first.
From Findings To Implementation
Turn Security Findings Into Practical IT Work
OC Security Audit can identify the accounting-firm security gaps, evidence needs, and compliance risks. When the next step is implementation, IT Perfection can help with managed IT, Microsoft 365 support, endpoint operations, backup and disaster recovery, server work, and network infrastructure support for the same business environment.
CPA And Tax Firm Security Pathways
Continue The Accounting Firm Security Review
Accounting-firm security is strongest when the professional audit, IRS WISP documentation, FTC Safeguards expectations, Microsoft 365 controls, ransomware readiness, incident response, firewall, vulnerability, and backup evidence are reviewed together. These connected pages help your firm move from broad risk visibility into the exact controls that need attention.
CPA / Tax Firm Security
Cybersecurity Audit for CPA Firms & Tax Preparers
Use this service page when the firm needs a professional review of taxpayer-data risks, Microsoft 365, backups, ransomware, WISP evidence, and remediation priorities.
CPA / Tax Firm Security
IRS WISP Compliance Consulting
Use this compliance page when the firm needs help building, reviewing, or improving a Written Information Security Plan and the technical evidence behind it.
CPA / Tax Firm Security
Accounting Firm Cybersecurity Hub
Start with the broad CPA, accounting, and tax-preparer cybersecurity roadmap before drilling into WISP, Microsoft 365, ransomware, and response planning.
CPA / Tax Firm Security
FTC Safeguards Rule for Accounting Firms
Review GLBA/Safeguards Rule concepts such as risk assessment, access control, MFA, encryption, monitoring, vendor oversight, and evidence.
CPA / Tax Firm Security
CPA Firm Cybersecurity Checklist
Organize the control review across WISP, MFA, email, endpoints, backups, firewall, vendors, tax software, and audit evidence.
CPA / Tax Firm Security
Tax Season Ransomware Readiness
Validate backup recovery, endpoint protection, remote access, Microsoft 365 security, continuity, and tax-season response readiness.
CPA / Tax Firm Security
Accounting Firm Incident Response Plan
Prepare for ransomware, mailbox compromise, lost devices, taxpayer data exposure, cyber insurance coordination, and client communication decisions.
FAQ
Questions Accounting Firms Ask
Can this review find mailbox forwarding rules?
Yes. Mailbox forwarding, suspicious inbox rules, transport rules, and external forwarding policies are core checks because they are common in business email compromise.
Does this include SharePoint and OneDrive sharing?
Yes. External sharing, anonymous links, guest access, sensitive document exposure, retention, and auditability should be reviewed for accounting firms.
Can IT Perfection help implement Microsoft 365 fixes?
When implementation support is needed after the audit, IT Perfection can assist with Microsoft 365 managed services and ongoing operational support.
Is this only for large firms?
No. Small and mid-sized accounting firms often have significant Microsoft 365 exposure because they rely heavily on email and cloud file sharing without dedicated security staff.
Next Step
Review The Controls Before A Client, Insurer, Or Incident Forces The Issue
OC Security Audit can help your accounting firm understand the most important gaps, document what needs attention, and plan remediation in a practical order.