7 Steps to Cyber Essentials Plus for UK SaaS: Secure Your Business & Win Contracts

By Krapton Engineering · Reviewed by a senior engineer · Last updated 25 Sept 2026

In 2026, UK businesses face an ever-evolving landscape of cyber threats, from sophisticated phishing campaigns to supply chain vulnerabilities. For Software-as-a-Service (SaaS) providers, demonstrating a robust security posture isn't just good practice; it's increasingly a prerequisite for winning new business, especially with public sector organisations and larger enterprises across the UK.

TL;DR: Cyber Essentials Plus is a government-backed cyber security certification crucial for UK SaaS. It covers five key technical controls – firewalls, secure configuration, access control, malware protection, and patch management – and requires an independent audit. Implementing these controls strengthens your security posture, builds customer trust, and unlocks new business opportunities, particularly with UK public sector and larger corporate clients.

Key takeaways

• Cyber Essentials Plus is a practical, auditable UK cyber security standard.
• It covers five core technical controls: firewalls, secure configuration, access control, malware protection, and patch management.
• Achieving it demonstrates a baseline of security, crucial for UK B2B SaaS providers aiming to meet supplier security requirements.
• The certification involves an initial self-assessment (Cyber Essentials) followed by a hands-on technical audit (Cyber Essentials Plus).
• Krapton helps integrate these security controls into engineering workflows, ensuring compliance and robust protection for your applications.

Why Cyber Essentials Plus Matters for UK SaaS Businesses in 2026

For any UK SaaS provider, securing your platform is paramount. Beyond protecting your data and your customers' data, strong cyber security is a significant competitive advantage. The National Cyber Security Centre (NCSC) developed the Cyber Essentials scheme to help organisations protect themselves against common online threats. Cyber Essentials Plus (CE+) takes this a step further, providing a verified, independent assessment of your technical controls.

For many UK public sector contracts, including those procured through frameworks like G-Cloud, having Cyber Essentials certification is mandatory. Increasingly, larger private sector companies are also stipulating CE+ as a minimum standard for their suppliers. This makes Cyber Essentials Plus for UK SaaS not just a compliance checkbox, but a strategic enabler for growth and market access.

Achieving this certification signals to potential clients that your organisation takes cyber security seriously, has implemented foundational protections, and has had these verified by an impartial expert. This builds trust, reduces procurement friction, and can significantly differentiate your offering in a crowded market.

Disclaimer: This article provides general information on Cyber Essentials Plus and its engineering implications. It does not constitute legal or professional advice. Always consult with certified cyber security professionals and legal experts for specific guidance on compliance.

The Five Technical Controls: An Engineering Perspective

Cyber Essentials Plus focuses on five key technical controls that, when properly implemented, can prevent up to 80% of common cyber attacks. Here's how these translate into engineering practice:

1. Secure Configuration

This control focuses on ensuring that devices and software are configured securely. Default settings are often insecure, leaving systems vulnerable. For SaaS applications, this means everything from your cloud infrastructure to your application servers, databases, and development environments.

Vulnerable Pattern: Using default administrator passwords, leaving unnecessary services running on production servers, or having unsecured API endpoints.

Hardened Pattern: Enforcing strong, unique passwords for all accounts, disabling or removing all non-essential services, and applying security patches promptly. This also extends to secure coding practices that prevent common vulnerabilities like SQL injection or cross-site scripting (XSS).

In a recent client engagement, we audited a new SaaS platform's default cloud configurations. We found numerous services with overly permissive IAM roles and default ports exposed, which could have been exploited. Our team implemented a strict baseline configuration, ensuring least privilege access and hardening all public-facing services. For example, ensuring SSH access is locked down:

# Example secure configuration for an Ubuntu server (relevant for SaaS hosting)
# Disable password authentication for SSH, enforce key-based auth
# File: /etc/ssh/sshd_config
# ...
PasswordAuthentication no
ChallengeResponseAuthentication no
UsePAM yes
X11Forwarding no
PrintMotd no
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
Match User root
    PermitRootLogin no
# ...

# Ensure unnecessary services are disabled (example for a web server)
sudo systemctl disable apache2 # if using Nginx
sudo systemctl stop apache2

2. Boundary Firewalls and Internet Gateways

Firewalls are essential for creating a secure boundary between your organisation's network and the internet. For SaaS, this primarily means configuring cloud-native firewalls and security groups correctly to control traffic flow.

Vulnerable Pattern: Opening all ports by default, allowing traffic from any IP address to critical services, or failing to segment networks.

Hardened Pattern: Implementing strict ingress and egress rules, allowing only necessary traffic on specific ports from trusted IP ranges. This requires careful network segmentation, using Virtual Private Clouds (VPCs) and subnets, and applying security groups (AWS, Azure, GCP) to restrict access to databases, application servers, and internal APIs.

Our team often leverages robust DevOps practices to automate firewall rule deployment and ensure consistency across environments, reducing the risk of manual misconfigurations.

3. Access Control

This control ensures that only authorised users can access systems and data. It's about managing user identities, authentication, and authorisation effectively.

Vulnerable Pattern: Shared accounts, weak password policies, lack of multi-factor authentication (MFA), or granting excessive permissions.

Hardened Pattern: Implementing strong password policies, enforcing MFA for all users (especially administrators and developers), and adopting the principle of least privilege. Role-Based Access Control (RBAC) or Attribute-Based Access Control (ABAC) should be used to define and manage permissions precisely. On a production rollout for a fintech client, implementing strict RBAC with MFA was crucial for meeting FCA operational resilience requirements, ensuring that only authorised personnel could access sensitive systems and customer data.

4. Malware Protection

Protecting against malicious software is critical. This involves deploying antivirus and anti-malware solutions on all relevant devices and ensuring they are kept up-to-date.

Vulnerable Pattern: Not having anti-malware software, disabling real-time protection, or failing to regularly scan for threats.

Hardened Pattern: Deploying reputable anti-malware solutions across all endpoints (user devices, servers). For SaaS applications, this extends to scanning uploaded files for malicious content, using Web Application Firewalls (WAFs) to filter malicious requests, and integrating dependency scanning tools (e.g., npm audit, pip-audit) into your CI/CD pipeline to catch known vulnerabilities in third-party libraries.

5. Patch Management

Software vulnerabilities are constantly discovered. Patch management ensures that all operating systems, applications, and firmware are kept up-to-date with the latest security fixes.

Vulnerable Pattern: Delayed patching, ignoring security updates, or having an incomplete inventory of software requiring updates.

Hardened Pattern: Implementing a robust patch management strategy that includes regular vulnerability scanning, automated updates where appropriate, and a process for promptly applying critical security patches across all servers, workstations, and network devices. The NCSC provides detailed guidance on effective patch management. Our team measures the time-to-patch for critical vulnerabilities, striving for a maximum of 14 days to deploy fixes across all production environments.

The Journey to Certification: Self-Assessment vs. Plus Audit

Understanding the difference between Cyber Essentials and Cyber Essentials Plus is key for UK SaaS providers:

The Cyber Essentials certification involves completing a self-assessment questionnaire, which is then reviewed by a certification body. Cyber Essentials Plus requires a hands-on technical audit by an independent, qualified assessor. This audit will typically involve:

• External vulnerability scans: To identify publicly accessible vulnerabilities.
• Internal vulnerability scans: To check for weaknesses within your network.
• Secure configuration checks: Verifying server, workstation, and application configurations.
• Malware protection tests: Ensuring your anti-malware software is effective.
• Patch management verification: Confirming that security updates are applied consistently.

When NOT to use this approach

While Cyber Essentials Plus provides an excellent baseline for cyber security, it is not a comprehensive, all-encompassing security framework. It focuses on foundational controls for common threats. It's not a replacement for more extensive certifications like ISO 27001 or SOC 2, which cover broader information security management systems, risk management, and organisational processes. For highly regulated sectors, such as health-tech (requiring NHS DSPT compliance) or financial services (with specific FCA operational resilience requirements), CE+ acts as a strong foundation but must be augmented with sector-specific controls and compliance efforts.

Common Engineering Pitfalls and How to Avoid Them

Even with good intentions, engineering teams can stumble on the path to Cyber Essentials Plus:

• Overlooking Developer Workstations: Developers' machines often hold sensitive code and access credentials. They must be configured securely, run up-to-date malware protection, and have strict access controls, just like production servers.
• Ignoring Third-Party Dependencies: Modern SaaS applications rely heavily on open-source libraries and frameworks. Vulnerabilities in these dependencies are a major supply chain risk. Implement automated dependency scanning and ensure timely patching.
• Lack of Clear Asset Inventory: You can't secure what you don't know you have. Maintain an accurate, up-to-date inventory of all IT assets, including servers, applications, databases, and network devices.
• Inconsistent Patch Management: Patching production servers but neglecting staging or development environments can create weak links. Ensure a consistent, automated patching strategy across all environments.
• Not Documenting Secure Configurations: Configuration drift is a common problem. Document your secure baseline configurations and use Infrastructure as Code (IaC) to enforce them programmatically, making your systems auditable and repeatable.

Verifying Your Controls: Continuous Security in Practice

Achieving Cyber Essentials Plus is not a one-off event; it's a commitment to ongoing security. Maintaining certification requires continuous vigilance and integration of security into your daily engineering workflows. This is where specialised software security services come into play.

• Automated Scans: Regularly run vulnerability scanners on your infrastructure and application code. Integrate static application security testing (SAST) and dynamic application security testing (DAST) into your CI/CD pipelines.
• Regular Internal Audits: Conduct periodic internal reviews of your security configurations and access controls to ensure they align with the CE+ requirements and NCSC guidance.
• Penetration Testing: Commission independent penetration tests to simulate real-world attacks and uncover vulnerabilities that automated tools might miss.
• Integrating Security into CI/CD (DevSecOps): Embed security checks and gates throughout your development lifecycle. This ensures that security is a shared responsibility and not an afterthought.

By adopting robust DevOps practices and a security-first mindset, you can build and maintain a secure SaaS platform that consistently meets and exceeds the standards set by Cyber Essentials Plus.

Partnering for Robust UK SaaS Security

Navigating the requirements of Cyber Essentials Plus, especially for a rapidly scaling SaaS business, can be complex. Partnering with an experienced engineering team that understands both technical implementation and UK-specific compliance can streamline the process significantly.

At Krapton, we bake security into every stage of the software development lifecycle. Our dedicated development teams are skilled in building secure web apps, mobile apps, and SaaS products, aligning with NCSC guidance and best practices for organisations operating in the UK. Whether you're building a new platform or hardening an existing one, we can help you implement the controls necessary to achieve Cyber Essentials Plus and maintain a strong security posture. Choosing a leading UK software development agency like Krapton ensures your applications are built with security at their core.

FAQ

How long does Cyber Essentials Plus certification take for a UK SaaS company?

The timeline varies significantly based on your current security posture and the complexity of your systems. Typically, after implementing the necessary controls, the audit process itself can take a few weeks. However, the preparation phase – identifying gaps, remediating vulnerabilities, and documenting processes – can range from 1 to 6 months, or even longer for organisations starting from a low security baseline.

What are the ongoing requirements after achieving Cyber Essentials Plus?

Cyber Essentials Plus certification is valid for 12 months. To maintain it, you must undergo a re-assessment annually. This ensures your security controls remain effective against evolving threats. Continuous monitoring, regular patching, and ongoing staff training are vital to stay compliant and secure.

Can Cyber Essentials Plus help with UK GDPR compliance?

Yes, Cyber Essentials Plus significantly contributes to UK GDPR compliance by implementing strong technical and organisational measures to protect personal data. The five controls directly address key GDPR principles like data minimisation, integrity, and confidentiality. While not a complete GDPR solution, it provides a robust foundation, particularly for the 'security of processing' aspect outlined in the Data Protection Act 2018.

Is Cyber Essentials Plus mandatory for all UK government contracts?

No, Cyber Essentials Plus is not mandatory for *all* UK government contracts. However, the basic Cyber Essentials certification is a mandatory requirement for suppliers bidding for many central government contracts that involve handling sensitive and personal information or providing certain IT products and services. CE+ is often required for higher-risk or more sensitive contracts, or for those above a certain value threshold.

Get a security-minded engineering team — talk to Krapton about software security services

Ready to secure your UK SaaS platform and gain the competitive edge that comes with verified cyber security? Krapton’s expert engineers are adept at implementing the controls required for Cyber Essentials Plus, ensuring your applications are robust, compliant, and trustworthy. Send Krapton a project brief today to discuss your software security needs.