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CPA Cybersecurity: Stay Protected Through Year-End and Beyond

Written by Cetrom | December 17, 2025

For accounting firms, cybersecurity isn’t just an IT task. It’s a critical part of client protection, operational continuity, and compliance. From phishing scams to ransomware attacks, today’s threats are more sophisticated and more persistent.

These risks only increase at year-end. Between November and January, attackers capitalize on reduced staffing, increased distractions, and overreliance on remote work. A recent FTI Cybersecurity report confirms this trend. Cybercriminals intensify campaigns during holidays, exploiting slower response times and lower vigilance.

For CPA firms managing sensitive financial data, it’s the perfect time to strengthen cybersecurity before risk becomes reality.

Why CPA Firms Are Prime Targets for Cybercrime

Hackers don’t need to look far to find vulnerable CPA firms. Tax records, payroll information, audit files, and personally identifiable data are all stored within firm systems. All of these are highly valuable on the black market.

According to Financial Cents, many accounting firms still rely on outdated infrastructure or limited internal IT oversight. This opens the door to costly breaches, especially during peak distraction periods.

Key risk factors include:

  • • Limited holiday IT coverage
    • Increased remote access from unsecured devices
    • Delayed software updates
    • Employee fatigue and phishing susceptibility
    • No active monitoring or incident response protocols

As outlined in Closing the IT Security Gap for CPA Firms, even well-meaning firms leave critical vulnerabilities exposed when IT resources are stretched thin.

Top Cyber Threats CPA Firms Should Watch For

Recognizing the most common attack vectors is the first step in protecting your firm.

1. Phishing and Spoofed Emails
Hackers impersonate clients, vendors, or firm leadership in emails that prompt urgent action. During holidays, rushed or unfamiliar staff are more likely to fall for them.

  1. 2. Ransomware
    Once inside, attackers encrypt your data and demand payment for release. Without real-time backups and an incident response plan, firms can face days of downtime or permanent data loss.
  1. 3. Unsecured Remote Access
    Staff using personal laptops or public Wi-Fi may unintentionally expose the firm's networks. Without encryption and access controls, attackers can move laterally once inside.
  1. 4. Unpatched Software
    Hackers actively scan for systems running outdated software. Even known vulnerabilities can be exploited if updates are delayed.
  1. 5. Limited Monitoring and Response
    Cybercriminals often strike when no one is watching. Without 24/7 monitoring, even minor issues can evolve into major breaches.

The guide Defending CPA Firms from Phishing offers specific examples of how these schemes are evolving and what firms can do to recognize them early.

Five Security Moves CPA Firms Should Make Now

With the right steps, firms can significantly reduce risk and increase resilience before, during, and after the holiday season.

  1. 1. Audit Your Current Security Environment
  2. Review user permissions, remote access logs, firewall rules, antivirus solutions, and open accounts. Apply least-access policies and close any gaps.
  1. 2. Enforce Multi-Factor Authentication (MFA)
  2. MFA adds a critical layer of protection. Even if credentials are compromised, unauthorized access is blocked.
  1. 3. Secure All Remote Devices and Connections
  2. Implement encrypted VPNs, restrict access to firm-authorized IP addresses, and enable remote wipe capabilities via MDM tools.
  1. 4. Conduct Employee Security Training
  2. Simulated phishing campaigns and short pre-holiday training refreshers can dramatically reduce risk from human error.
  1. 5. Build an Incident Response Plan
  2. List key contacts, define escalation protocols, and ensure authorized personnel have access to credentials and recovery tools.

For firms looking to improve staff awareness, Steps Accounting Firms Should Take for Cybersecurity Awareness highlights easy-to-implement training practices.

How Cetrom Protects CPA Firms Year-Round

When cybersecurity matters most, Cetrom delivers secure, managed IT solutions built specifically for CPA firms. Our approach combines compliance-ready infrastructure with real-time support to keep your systems protected, your team productive, and your clients’ data safe.

24/7/365 IT Support

Cetrom provides round‑the‑clock support from senior‑level, US‑based engineers who understand the needs of accounting firms. This support is available any time your team needs help, whether it is during extended hours, peak workload periods, or critical deadlines. 

Cetrom’s approach gives you direct access to experienced engineers and goes beyond basic ticketing systems to deliver real solutions when issues arise.

Cloud Hosting Built for Accounting

We manage and secure your critical applications, including CCH, Thomson Reuters, QuickBooks, Lacerte, and more. Everything is hosted in a virtual environment designed for accounting workflows and performance.

As discussed in Accounting Firms Are Benefiting from Eliminating Onsite Servers, firms that move to the cloud improve flexibility, reduce risk, and simplify IT management across locations.

Proactive Cybersecurity Infrastructure

We manage and secure your critical applications, including CCH, Thomson Reuters, QuickBooks, Lacerte, and more. Everything is hosted in a virtual environment designed for accounting workflows and performance.

Our deep dive into EDR and MDR – Essential Security Benefits explains why passive monitoring is no longer enough.

Backup and Disaster Recovery

We deliver continuous, encrypted backups across geographically diverse data centers. This ensures uptime, compliance, and peace of mind.

Built for the Way CPA Firms Operate

IT leaders require reliable infrastructure, expert support, and assurance that systems will perform optimally during peak workloads. Operations managers seek technology that streamlines daily workflows, boosts productivity, and ensures compliance without consuming resources. Managing partners prioritize client trust, uninterrupted access to systems, and long-term value from every technology investment.

Cetrom supports all of these needs. With over 25 years of experience and blocking more than 1.3 million threats annually, we deliver what accounting firms expect from a trusted IT partner: confidence, compliance, and continuity.

The article Smart CPAs Choose Strategic IT Partners: Here's Why outlines what makes long-term IT partnerships so impactful for firm growth and security.

Make 2026 Your Most Secure Year Yet

As tax season approaches and your team prepares for the year ahead, this is the ideal time to evaluate your cybersecurity foundation.

With Cetrom, your firm gets more than managed cloud services. You gain a dedicated IT partner who understands the accounting industry, supports compliance, and delivers reliability when it matters most.

Schedule Your CPA Cybersecurity Review Today

Cyber threats continue to evolve. Cetrom helps your firm stay ahead with expert guidance, always available support, and a security-first approach tailored to CPAs.