CREST-Certified Thick Application Testing
Independent thick client application testing delivered by CREST-certified ethical hackers. Our UK-based team identifies exploitable vulnerabilities in locally deployed client-server applications.
- CREST-certified penetration testers
- Trusted UK thick application testing provider
- Clear reporting and remediation guidance
Trusted by organisations across regulated industries including finance, healthcare, enterprise software, and critical infrastructure.
Thick Application Testing Services From OmniCyber
Our thick client application testing services help organisations identify security weaknesses in locally installed software before attackers can exploit them.
Using a structured testing methodology, our testers simulate real-world attack techniques to assess how your thick client applications and their backend infrastructure withstand compromise.
We provide thick application testing across the UK, supporting organisations that need security assurance, compliance validation, or an independent assessment of their client-server software.
When Do You Need Thick Application Testing?
Most organisations with locally installed client-server software eventually need to prove their security controls actually work. A professional thick client test provides independent validation that your applications can withstand real-world attack techniques.
You may need thick application testing services if you:
- Deploy custom-built or third-party thick client applications on internal networks
- Are preparing for a compliance audit or security assessment
- Process or store sensitive data within locally installed software
- Have released a new version or made significant changes to your application
- Need an independent security testing provider to review your software
Whatever the driver, the goal is the same. You need testing carried out by certified ethical hackers, using realistic attack techniques, with results you can trust to make informed security decisions.
Choosing the Right Time To Test Your Thick Application Testing?
Timing your thick client test effectively is just as important as the test itself. Getting it right means vulnerabilities are caught before they reach production, compliance requirements are straightforward to meet, and your applications stay resilient as they evolve.
The scenarios below are where thick client testing delivers the greatest value, along with our recommended approach to timing:
| Testing scenario | When to test |
|---|---|
| Prior to launching a new desktop or locally installed application | Test during pre-production to verify the security of client-side logic, local data handling, and communication channels before the application is deployed to users. |
| Following significant feature releases or infrastructure changes | Run a targeted test as soon as new modules, third-party integrations, or API connections are introduced, to confirm they have not created exploitable security gaps. |
| When operating in a regulated or compliance-driven sector | Schedule testing to align with regulatory review cycles in industries such as financial services, healthcare, or the public sector, providing evidence of adherence to standards including PCI DSS, ISO 27001, and NHS DSPT. |
| During or after migration away from legacy systems | Test at the point of migration or immediately after to ensure that outdated libraries, deprecated protocols, or insecure configurations from legacy environments have not been carried across. |
| As part of routine annual or bi-annual security reviews | Include thick client testing within your regular security assessment programme to keep mission-critical software resilient against new attack techniques and emerging zero-day threats. |
A Trusted Approach To Thick Application Testing
Our Thick Application Testing Methodology
As an experienced thick client testing provider, OmniCyber follows a structured and transparent methodology aligned with recognised security testing standards. Our CREST-certified testers combine automated analysis with expert manual testing to simulate how real attackers identify and exploit vulnerabilities in client-server applications.
- Scoping and Architecture Review: We define the scope of your thick client test, reviewing the application’s client-server architecture, communication protocols, and the technologies in use to ensure testing is targeted and thorough.
- Front-End Testing: Testing of the client-side application includes dynamic fuzzing of input functions to identify crashes and buffer overflows, logic flaws, and insecure data handling within the application itself.
- Back-End and Network Traffic Testing: Our testers intercept and manipulate requests made between the client and controlling server, identifying insecure communication channels, authentication weaknesses, and injection vulnerabilities.
- Authentication and Session Management: We assess how the application handles user authentication, session tokens, and privilege levels, testing for escalation opportunities and insecure credential storage.
- Risk-Based Reporting: All findings are prioritised according to likelihood of exploitation and potential business impact, helping your team focus remediation efforts effectively.
Let Us Help You Today.
Our Thick Application Testing Services
OmniCyber provides a full range of thick client testing services in the UK, helping organisations identify vulnerabilities across client-side applications, their backends, and supporting infrastructure.
Front End Application
Testing of the client-side application layer, including input validation, dynamic fuzzing, buffer overflow identification, and crash analysis to expose client-side vulnerabilities.
Back-End and API Testing
Manipulation of requests made between the thick client and its controlling server to identify injection flaws, broken access controls, and insecure data transmission pathways.
Network Traffic Analysis
Interception and analysis of network communications between client and server to identify unencrypted data, insecure protocols, and man-in-the-middle attack opportunities.
Authentication Testing
Assessment of how the application manages user credentials, session tokens, and privilege escalation, including testing for insecure storage of authentication data on the client device.
Local Data Storage Review
Examination of how sensitive data is stored locally on the client device, including registry entries, temporary files, configuration files, and cached credentials.
Database Interaction Testing
Assessment of how the thick client interacts with backend databases, including SQL injection testing, privilege abuse, and insecure direct object reference vulnerabilities.
Thick Application Testing for Compliance Frameworks
Many organisations require thick client application security testing to meet regulatory and compliance requirements. OmniCyber supports organisations preparing for or maintaining compliance with recognised security frameworks.
This includes:
- ISO 27001
- Cyber Essentials Plus
- PCI DSS
- NHS DSPT
- DORA
- GDPR security risk assessments
Our CREST-certified thick application testing helps organisations validate that security controls are working effectively and provides evidence required for compliance and assurance.
What You Recieve From a Thick Application Test
A professional thick client test will provide clear insight into how attackers could compromise your application and what actions should be taken to reduce risk.
This includes:
- Clear evidence of exploitable vulnerabilities
- How attackers could gain and escalate access
- What data or systems would be exposed
- Which security controls fail under pressure
- What to fix first, prioritised by risk
- Clear reporting for technical and non-technical stakeholders
These insights are delivered in a structured report that places vulnerabilities in context, allowing your organisation to prioritise remediation and make informed security decisions.
A CREST-Certified Thick Application Testing Company You Can Trust
Thick application testing only delivers value when it is performed responsibly, consistently, and to recognised professional standards.
These standards help ensure testing is accurate, ethical, and suitable for organisations operating in regulated or high-risk environments.
Get a tailored quote from a trusted testing provider
What Our Clients Say About Our Services
Organisations across multiple industries trust OmniCyber to deliver professional penetration testing and clear security insights.
“What stands out most is the feedback I hear after introducing others to OmniCyber. They consistently say the team are the best penetration testers they have worked with because they work with you, not just against your systems.”
Global Travel Company
Head of Security
“Your report is the most detailed and practical we have reviewed. The level of clarity and prioritisation made it easy to understand what needed attention.”
Healthcare Industry
DevOps Manager
“The work and interactions (with Louie Augarde in particular) were so impressive we wouldn’t even consider tendering elsewhere at this point.”
UK Registered Charity
IT Infrastructure Manager
A Trusted Approach To Penetration Testing
Why Choose OmniCyber as Your Pen Testing Provider?
OmniCyber is an established UK cyber security company, founded in 2015, with a proven track record of delivering penetration testing services for organisations operating in regulated and high-risk environments.
We work with both global enterprises and SMEs, providing security testing that supports compliance, assurance, and real-world risk management.
Clients choose OmniCyber because we deliver thick application testing that is thorough, reliable, and tailored to their environment.
- Highly certified testers chosen for technical skill and sound judgement
- Ongoing investment in training to stay current with modern attack techniques
- Clear, risk-led reporting prioritised by criticality and business impact
- Proven delivery across diverse and regulated environments
- Trusted by organisations protecting sensitive and high-value data
If you are comparing thick application testing companies, experience, care, and clarity matter far more than price alone.
Thick Application Testing Pricing & Quotes
Thick client testing costs vary depending on the scope, complexity, and application being tested. To ensure accurate pricing, we provide scoped thick application testing quotes based on:
- The goals of the test (compliance validation, security assurance, or full attack simulation)
- Testing approach (unauthenticated, authenticated, or both)
- Number of applications, user roles, and interfaces in scope
- Front-end only vs full client-server testing scope
- Infrastructure complexity and technologies involved
- Compliance or regulatory requirements
- Available budget and preferred testing depth
Speak to one of our security specialists to receive a tailored thick application testing quote aligned with your organisation’s testing objectives.
Why Omni
We use industry certified techniques and tools to help clients rapidly identify and rectify security gaps everywhere their people, products and customers interact with technology.
Some of the biggest brand globally trust our highly qualified and experienced team to ensure their systems and infrastructure are secure and compliant.
Whilst our teams can be relied upon to provide excellence in a single engagement, Omni excel at helping our clients mitigate the risks of their changing threat landscape for the long term, through a bespoke delivery of compliance and security services.
PEN TESTING
Find out where you are vulnerable, before hackers do
Sometimes offence is the best defence against cyber criminals. That’s why we provide a detailed mix of IT security services like CREST certified penetration testing, social engineering, web application testing and more. We search for the security gaps and give you the streamlined recommendations you need to fill them fast.
MANAGED SECURITY
Prevention is the best medicine
The average cost of a data breach in 2019 came at the bargain price of US$3.92 million. Large enterprises have the resources to absorb a hit like this, but most businesses don’t. This is where Managed Security comes in. As your embedded cybersecurity team, we provide network monitoring and advanced threat detection to minimise your risk of business disruption.
COMPLIANCE
Safeguard data, protect your customers and yourself
Do you get butterflies when you hear the words GDPR, PCI DSS, IASME, PIPEDA, CCPA? Getting Compliance right is a big deal and gets more complicated day-by-day. We can help. Our Compliance team has all the knowledge and tools you need to integrate best practices for data privacy across your entire organization and keep you resilient in face of a data breach.