How Can Companies Build Continuous Application Security Testing?

Companies need a continuous approach that helps identify vulnerabilities as their applications change. Continuous application security testing combines regular vulnerability assessments, penetration testing, automated checks, remediation, and retesting to reduce security gaps throughout the application lifecycle.

But how can companies build an effective continuous application security testing process?

Start With Regular Vulnerability Discovery

Continuous security begins with knowing where vulnerabilities exist. A vulnerability assessment can help organizations identify weaknesses across applications, infrastructure, configurations, and exposed services.

Regular assessments can detect issues such as outdated components, insecure configurations, exposed services, and known vulnerabilities. They provide security teams with visibility into weaknesses that may require further investigation.

However, vulnerability scanning alone does not show whether a weakness can actually be exploited in a real attack. This is why continuous testing should combine automated discovery with deeper security validation.

Test Web Applications Regularly

Web applications are frequent targets because they often expose authentication systems, user accounts, APIs, payment functions, and sensitive business workflows to the internet.

Regular web application penetration testing can help identify vulnerabilities that automated tools may not fully understand. Testers can evaluate authentication, authorization, session management, input validation, business logic, and other application-specific weaknesses.

Organizations should consider testing after major feature releases, architectural changes, authentication updates, or significant changes to business logic.

Include Mobile Applications and APIs

A continuous application security program should not focus only on websites. Mobile applications can introduce additional attack surfaces through APIs, authentication mechanisms, local data storage, and communication with backend systems.

Mobile application penetration testing can help identify weaknesses across the mobile application and its supporting backend services.

Companies should also ensure that APIs are included in their testing strategy. Changes to an API can affect authentication, authorization, data exposure, and application workflows even when the visible user interface remains unchanged.

Combine Automated Testing With Manual Testing

Automation is valuable for continuous security because it can run frequently and identify many known vulnerabilities quickly. However, automated tools may struggle with complex business logic, authorization flaws, chained vulnerabilities, and application-specific attack paths.

Manual testing adds another layer of validation by examining how vulnerabilities could potentially be combined or exploited.

Companies can use automated testing for frequent monitoring while scheduling manual penetration testing at appropriate points throughout the development and release lifecycle. This approach provides both scale and deeper security analysis.

For an overview of how penetration testing works, see What Is Penetration Testing?.

Add Continuous Penetration Testing

For organizations with rapidly changing applications, traditional periodic testing may leave gaps between assessments. A vulnerability discovered shortly after a scheduled penetration test may remain undetected until the next testing cycle.

Continuous penetration testing helps address this challenge by providing more frequent security validation as environments change.

The exact approach depends on the organization's applications, infrastructure, release frequency, risk level, and security requirements. The objective is not necessarily to test everything every day. Instead, testing should be aligned with meaningful changes and areas of risk.

Build Security Into the Release Process

Application security becomes more effective when testing is connected to software development and release workflows.

Companies can define security checkpoints such as:

• Vulnerability scanning during development

• Security testing before major releases

• Penetration testing for significant application changes

• Retesting after vulnerabilities are fixed

• Additional testing after major architectural changes

• Continuous monitoring of exposed applications and services

This creates a repeatable process rather than treating security as a final step before deployment.

Prioritize Vulnerabilities Based on Risk

Continuous testing can produce a large number of findings. Treating every vulnerability with the same urgency can make remediation inefficient.

Security teams should consider factors such as exploitability, exposure, affected assets, sensitive data, business impact, and whether vulnerabilities can be chained together.

A vulnerability affecting an internet-facing authentication system may require faster attention than a lower-risk issue on an isolated internal component.

This prioritization should become part of the organization's broader vulnerability management process.

Retest After Remediation

Finding a vulnerability is only one part of the process. Organizations also need to confirm that security issues have actually been fixed.

After remediation, security teams should retest relevant vulnerabilities to determine whether the original issue has been resolved and whether the fix introduced another weakness.

This creates a continuous cycle:

Discover → Validate → Prioritize → Remediate → Retest → Monitor → Repeat

The cycle allows security teams to continuously improve application security rather than relying on isolated testing events.

Determine How Often Applications Should Be Tested

There is no universal testing schedule for every company. Testing frequency should reflect application risk, release velocity, business impact, exposure, and regulatory requirements.

Organizations with frequent releases or highly exposed applications may need more frequent testing. Companies with slower development cycles may use periodic penetration tests combined with regular vulnerability assessments.

How Often Should a Business Perform a Penetration Test? provides additional guidance on factors that can influence testing frequency.

Consider the Cost and Available Resources

Continuous application security does not necessarily mean running expensive security tests continuously. Companies should build a testing strategy around their risk profile and available resources.

Understanding vulnerability assessment costs and penetration testing costs can help organizations plan their security budgets.

Smaller businesses can also create practical testing programs by prioritizing their most important applications and gradually expanding coverage. How Much Should a Small Business Spend on Cybersecurity? discusses how organizations can approach cybersecurity spending based on their needs and risks.

Work With the Right Security Testing Provider

Building continuous application security may require a combination of internal security resources and external expertise. When selecting a security testing provider, companies should evaluate experience, testing methodology, reporting quality, technical expertise, scope, and retesting processes.

Organizations can use How to Choose a Penetration Testing Company in 2026 as a reference when evaluating potential providers.

Build Security Into the Entire Application Lifecycle

Continuous application security testing works best when it becomes part of the application's lifecycle rather than a standalone security project.

A practical approach can look like this:

Development → Automated Testing → Vulnerability Assessment → Release Testing → Penetration Testing → Remediation → Retesting → Continuous Monitoring

This process helps companies identify security weaknesses earlier, validate important risks, prioritize remediation, and confirm that fixes work.

As applications continue to evolve, security testing must evolve with them. By combining regular vulnerability discovery, web and mobile application testing, manual penetration testing, continuous monitoring, and structured remediation, companies can build a security process that keeps pace with application changes and reduces the opportunity for vulnerabilities to remain unnoticed.