Why annual penetration tests are no longer enough

Cybersecurity has changed. For many organisations, an annual penetration test has become a box-ticking exercise. A report is produced, a handful of issues are fixed, and everyone moves on until the following year. The problem is that software doesn’t stand still for twelve months anymore.

New features are released weekly. APIs are added. Third-party integrations change. AI-generated code is introduced. Developers update packages. Cloud environments evolve.

By the time next year’s penetration test arrives, the system being tested may be significantly different from the one that was originally assessed. The question businesses should be asking is not whether they have completed a penetration test. The question is whether their software is still secure today.

What is a penetration test designed to do?

Penetration testing remains an important part of a cybersecurity strategy. A penetration test simulates how an attacker might attempt to compromise a system, website, application or network. The objective is to identify vulnerabilities before a malicious actor does.

When conducted properly, penetration testing provides valuable insight into:

• Security weaknesses
• Misconfigurations
• Authentication issues
• Data exposure risks
• Vulnerabilities that automated tools may miss

The issue is not with penetration testing itself. The issue is relying on a point-in-time assessment in a world where technology changes constantly.

The problem with annual testing

Imagine taking your car for an MOT and then driving it for another 50,000 miles without checking it again. Most people would agree that sounds risky. Yet this is effectively how many organisations approach cybersecurity. A penetration test provides a snapshot of security at a specific moment in time.

The report might accurately reflect the state of the application on the day it was tested. However, what happens after that report is delivered?

Over the following months, businesses often:

• Release new software updates
• Integrate new third-party services
• Deploy AI-generated code
• Install new plugins and dependencies
• Change user permissions
• Add new APIs and connections

Every change introduces the possibility of new vulnerabilities. Security is not static because software is not static.

Modern software creates new risks every week

Most businesses no longer operate a single standalone system. Instead, they rely on a growing ecosystem of technology.

Customer portals connect to CRMs. Websites connect to payment gateways. Applications connect to cloud services. Middleware moves data between systems. Marketing platforms exchange customer information. Inventory systems synchronise with e-commerce platforms.

Each integration creates value. Each integration also creates risk. The challenge is that many vulnerabilities emerge long after a penetration test has been completed. A secure application can become vulnerable simply because a third-party component introduces a security flaw, an API changes behaviour, or a dependency reaches end of life.

None of these issues wait for the next annual assessment.

The rise of AI-generated code

Artificial intelligence is helping businesses develop software faster than ever before. Developers are increasingly using AI tools to write code, generate functions, suggest fixes and accelerate delivery.

The benefits are clear. However, speed should never be confused with security.

Research continues to show that AI-generated code can introduce vulnerabilities, insecure authentication methods, exposed secrets and poor coding practices if not properly reviewed. The risk isn’t that AI writes bad code every time. The risk is that vulnerabilities can be introduced into production environments far more quickly than traditional review processes can identify them.

This makes continuous visibility even more important.

Cyber criminals don’t work to annual schedules

One of the biggest misconceptions in cybersecurity is the belief that threats occur at predictable intervals. Attackers are not waiting for your next security review.

New vulnerabilities are discovered daily. Threat actors continuously scan websites, applications and systems looking for weaknesses they can exploit. Many attacks are now highly automated.

The gap between a vulnerability being discovered and being actively exploited has become significantly shorter. For businesses relying solely on annual testing, this creates a substantial window of exposure. A vulnerability introduced next month could remain undetected for almost a year.

What does a modern security approach look like?

Penetration testing should still form part of a security strategy. However, it should not be the only layer.

Leading organisations are increasingly combining traditional security assessments with ongoing monitoring and continuous vulnerability management.

This typically includes:

Regular vulnerability scanning

Automated scanning helps identify known vulnerabilities across applications, websites and codebases as changes occur.

Software supply chain monitoring

Understanding which third-party libraries, frameworks and dependencies are being used allows organisations to respond quickly when new vulnerabilities are disclosed.

Secure development practices

Security should be built into the software development process rather than added at the end.

Continuous visibility

Businesses need visibility into how their systems are changing and whether those changes introduce new risks.

The objective is not simply to find vulnerabilities. The objective is to reduce the amount of time vulnerabilities remain undetected.

Security is a process, not a project

Many organisations treat cybersecurity as something that can be completed. It cannot. Security is not a one-off project. It is not a yearly exercise.

It is an ongoing process that evolves alongside the technology it protects. A penetration test remains a valuable tool, but it is only one part of a much larger picture.

The organisations best positioned to defend themselves are those that recognise security is continuous. Because in modern software environments, the biggest risk is often not the vulnerability you already know about.

It’s the one that appeared yesterday.

Is your software still secure?

If your last penetration test was completed six months ago, how much has changed since then?

New features, integrations, plugins, dependencies and AI-generated code can all introduce risk long after a report has been signed off. Continuous visibility helps organisations identify vulnerabilities sooner, reduce exposure and maintain confidence in the software they rely on every day.

If you’re unsure what risks may exist within your applications, websites or software supply chain, now is a good time to take another look.