Security testing: reduce risks and protect your systems

With the rise of cyber threats, security testing has taken on a strategic role in protecting applications, systems, and corporate operations.

Security flaws can cause losses worth millions, compromise sensitive data, and directly affect the trust of customers, partners, and investors, in addition to impacting the brand's reputation in the market.

In this scenario, security testing helps companies turn a reactive stance into a preventive strategy, reducing vulnerabilities before they cause operational disruptions or critical incidents.

In practice, these tests work as a structured process to identify vulnerabilities and weak points in systems, networks, and applications before attackers exploit them.

More than just locating flaws, this approach makes it possible to analyze risks, prioritize fixes, and strengthen the integrity, confidentiality, and availability of corporate information.

In this article, we will explore the main methods used by companies, from Penetration Testing (Pentest) to the more recent SAST and DAST approaches.

Enjoy the read!

What is security testing?

Security testing is a structured set of activities carried out to identify, analyze, and report vulnerabilities in a system, application, or network infrastructure.

Its main goal is to simulate the actions of a malicious cyber attack to identify flaws that could be exploited.

While other tests only verify functionality, security testing assesses the resilience of your product, focusing on issues such as data integrity, the confidentiality of user information, and system availability under threat.

In this way, it is an investment in failure prevention during the development of the software architecture, ensuring that your product's foundation is well protected.

What is security testing used for?

According to the security report released by Indusface in the first quarter of 2024, cyber attacks grew 76% compared with the same period in 2023, totaling 1.89 billion blocked attacks from January to March 2024.

Faced with the exponential growth of threats, security testing has become a strategic practice to identify vulnerabilities, reduce operational risks, and strengthen the resilience of corporate systems.

In addition to preventing possible leaks of sensitive data, these tests help companies reduce financial impacts and avoid penalties related to the General Data Protection Law (LGPD), preserving the brand's reputation and the trust of customers and partners.

In corporate environments, security flaws can interrupt critical operations, compromise important integrations, and generate high costs with system recovery, emergency support, and technical rework.

For this reason, performing security testing helps increase the company's digital maturity, strengthen application protection, and make development processes more secure and efficient.

In this context, security testing stops being just a corrective measure and becomes part of the operational continuity strategy and the protection of organizations' digital assets.

Examples of security testing

There are several tools, strategies, and types of security testing to implement in your company.

The threat landscape is diverse, so the security response also needs to be.

There is no single solution to ensure the complete protection of your digital assets.

That is why it is important to understand that effective security depends on the strategic combination of different types of tests.

For risk mitigation to be effective, it is essential to know the main types of security testing and their applications.

Below, we present the most common and crucial examples for defending applications and infrastructure:

External Pentest: simulates an external attack, trying to gain access from the outside in.
Internal Pentest: simulates an attack from inside the network, such as a malicious employee or an attacker who has already gained access to a user account.
Application security testing (AST): assesses the security of software and applications during development and operation.
Wi-Fi network security testing: looks for weak security algorithms, weak passwords, and other flaws in wireless networks.
Mobile application security testing (MAST): simulates attacks on mobile apps to find specific vulnerabilities, such as malicious networks and data leakage.

Therefore, protecting systems depends on a strategic combination of methodologies to identify vulnerabilities and security risks.

It is not just about applying one test, but about understanding which one offers the greatest effectiveness for your software at the right time.

What mistakes compromise the effectiveness of security testing?

Performing security testing is an essential step to reduce vulnerabilities and strengthen the protection of applications and infrastructures.

However, the effectiveness of this strategy depends directly on how the tests are planned, executed, and incorporated into the company's routine.

In many cases, organizations invest in advanced tools and methodologies but still struggle to identify critical risks due to process flaws, lack of continuity, or lack of integration between teams.

That is why understanding the most common mistakes helps increase the efficiency of the analyses, reduce rework, and strengthen security maturity throughout the development cycle.

Why does running tests only at the end of the project increase risks?

One of the most common mistakes is concentrating security testing only in the final stages of development, close to the application's release.

When vulnerabilities are discovered late, the fixing process tends to be more complex, costly, and time-consuming, especially in systems with a larger software architecture or critical integrations.

Beyond the technical impact, vulnerabilities identified at the end of the project can:

Delay deliveries and schedules;
Increase the teams' rework;
Raise fixing costs;
Compromise critical integrations;
Affect the application's stability in production.

For this reason, companies that adopt DevSecOps practices integrate security testing from the earliest stages of the development cycle, making it possible to identify risks more quickly and reduce operational impacts.

This continuous approach contributes to more resilient applications, more efficient delivery cycles, and greater predictability as the software evolves.

How does the lack of continuous testing affect application security?

Another recurring mistake is treating security testing as a one-off activity, performed only during audits, acceptance reviews, or specific periods of the project.

The problem is that modern applications constantly undergo changes, such as:

Adding new features;
Integrations with external systems;
Infrastructure updates;
Changes to APIs;
Adjustments to the production environment.

Without a continuous validation process, vulnerabilities can remain invisible for long periods, increasing the risks of exploitation, data leakage, and operational unavailability.

In addition, the lack of recurring monitoring makes it harder to quickly identify problems introduced after updates or changes to the environment.

That is why more mature companies incorporate test automation and continuous checks into development pipelines, strengthening application protection without compromising delivery agility.

Which flaws most often go unnoticed in companies?

Many vulnerabilities exploited in cyber attacks are not necessarily related to complex problems, but rather to inadequate configurations and operational flaws that go unnoticed during the development and maintenance of environments.

Among the most common vulnerabilities are:

Excessive access permissions;
Inadequate authentication;
APIs exposed without sufficient protection;
Weak passwords;
Incorrect server and database configurations;
Outdated libraries;
Vulnerable components;
Flaws in integrations with external services.

Without a structured security testing strategy, these problems can remain active for long periods, compromising sensitive data, critical operations, and the reliability of corporate systems.

That is why combining different analysis approaches, such as Pentest, SAST, and DAST, helps broaden visibility into technical risks and strengthen the protection of the digital environment more comprehensively.

What are the approaches to security testing?

In the previous section, we explored the types of security testing and, in this one, we will understand which testing approaches are available.

Choosing the ideal approach depends on two factors: what will be tested (code, application, or network) and the moment of assessment in the software development life cycle (SDLC).

To build your own defense strategy, it is important to understand the characteristics of each of the main approaches.

SAST vs. DAST

These approaches identify vulnerabilities in systems in different and complementary ways, allowing a broader analysis of application security throughout the development cycle.

SAST (Static Application Security Testing), also known as "white box testing," analyzes the source code to identify flaws during the product's development.

Its goal is to detect vulnerabilities before the application is deployed, including coding errors, backdoors, structural inconsistencies, and violations of security standards.

Because it works in the early stages of development, SAST helps technical teams reduce rework, speed up fixes, and increase delivery predictability.

In contrast, DAST (Dynamic Application Security Testing), known as "black box testing," assesses the running application to simulate attacks in real usage scenarios.

This approach identifies vulnerabilities that only appear during the system's operation, such as authentication problems, server configuration errors, and flaws in session management.

While SAST works directly on the source code, DAST analyzes the behavior of the application in operation, offering a complementary view of the attack surface.

Comparison between SAST and DAST testing

SAST is faster and has a lower cost for fixing problems early, allowing developers to correct errors quickly and save time at the end of the project.

DAST, on the other hand, detects runtime and configuration problems, which is not possible with SAST.

Because they act in different development cycles of the application, these approaches are vital and complementary, helping companies strengthen application security without compromising the teams' operational agility.

For this analysis to be efficient and not create rework, it is crucial to have a well-structured automation framework that integrates the results of both tests and optimizes their evolution in QA (Quality Assurance).

Penetration Testing (Pentest)

Penetration Testing (Pentest) enhances the security assessment of applications.

The Pentest is the simulation of a previously authorized attack, conducted by specialists called pen testers, who use creativity, logic, and human reasoning to identify and exploit vulnerabilities.

Its goal is to identify and exploit a flaw, quantifying its impact on the system in the event of attacks.

To do so, the Pentest has well-defined methodologies, which can be classified according to the level of prior information given to the tester:

Black Box: the tester receives no internal information, which simulates an external attack.
White Box: the pen tester has full access to the code and the architecture, simulating an internal attack or a malicious developer.
Gray Box: the tester receives limited information, simulating a user with privileges.

Therefore, the Pentester is a validator of security controls, offering a view of the security risks of your application or infrastructure and providing the data needed to fix flaws.

Network Security Assessment

The Network Security Assessment is the approach aimed at identifying vulnerabilities and configuration flaws in the infrastructure that supports the organization's systems.

This process involves reviewing network devices, configurations, security policies, and how data is transmitted and stored.

Its goal is to ensure that the network is protected against cyber attacks and other threats, as well as to ensure the integrity and confidentiality of information.

The purpose of this assessment covers critical assets such as:

Edge Devices: firewalls, routers, and intrusion prevention systems (IPS).
Servers and hosts: patch management, hardening, and operating system configurations.
Architecture: network segmentation, access policies (access control), and communication protocols.
Wireless networks: Wi-Fi configurations and access point security.

The Network Security Assessment ensures that the company's infrastructure is properly protected against unauthorized access and denial-of-service attacks.

This assessment complements the Pentest by ensuring that the foundations of information security, known as Confidentiality, Integrity, and Availability (CIA), are established in the operational environment.

How does security testing impact companies in practice?

Security testing goes well beyond identifying technical vulnerabilities.

In practice, it helps companies reduce operational risks, strengthen the continuity of operations, and increase the reliability of corporate applications and systems.

With the evolution of digital threats and the growing dependence on connected environments, security is no longer just a technical responsibility and now directly influences operational stability, customer experience, and organizations' reputation.

That is why companies that invest in continuous testing can anticipate problems, reduce financial impacts, and make more strategic decisions about technology, infrastructure, and data protection.

How does security testing help reduce operational costs?

Identifying vulnerabilities before they are exploited helps companies reduce technical and operational costs throughout the development cycle.

When problems are discovered early, it is possible to avoid impacts such as:

Operational disruptions;
System unavailability;
Technical rework;
Emergency support;
Leakage of sensitive data;
Compliance-related penalties.

In addition to reducing losses, security testing also increases delivery predictability and helps teams work more efficiently.

That is why more mature companies adopt continuous testing to strengthen application stability and optimize technical resources.

How do tests strengthen the trust of customers and partners?

Data protection has become a decisive factor for companies that handle sensitive information from customers, partners, and suppliers.

In this context, security testing demonstrates a commitment to:

Protection of corporate data;
Regulatory compliance;
Application stability;
Incident prevention;
Reliability of digital services.

In addition to reducing technical risks, this practice strengthens the company's reputation and contributes to safer, more transparent business relationships.

In sectors such as finance, healthcare, and technology, keeping applications protected has also become an important competitive advantage.

Why do mature companies adopt continuous testing?

Companies with greater digital maturity understand that security must be part of the development and operations routine, not just isolated stages of the project.

Because modern applications undergo frequent updates, new vulnerabilities can constantly arise without a continuous validation process.

That is why more structured organizations use recurring tests to:

Identify risks more quickly;
Reduce vulnerabilities in production;
Increase operational efficiency;
Improve delivery predictability;
Speed up fixes without compromising quality.

This approach strengthens the integration between development, security, and operations, creating more resilient environments that are prepared for constantly evolving threats.

The 5 steps to implement effective security

Knowing how security testing works is a great start, but it is essential to understand how its methodologies are applied.

To have effective security, these tests need to be applied continuously, with discipline, planning, and integration of the fixes into your routine.

Thus, the successful implementation of a verification strategy requires a clear roadmap that ensures the optimized use of resources, mitigating the most critical risks.

To turn theory into a practical and sustainable defense, your organization can follow these five fundamental steps:

Step 1: define the purpose and objectives

Having a clear definition of the purpose and objectives is the basis for the entire security testing process, avoiding the waste of resources on low-risk areas or letting critical flaws go unnoticed.

With that, when defining the scope of the tests, we delimit which assets will be assessed, detailing and documenting their specifics, such as:

Assets: which applications, APIs, IP ranges, domains, or software modules will be included?
Limits: which areas cannot or should not be touched to avoid operational damage?
Access: what level of access will the testers have? This stage is fundamental to decide between a Black Box, White Box, or Gray Box Pentest, for example.

The objectives, in turn, indicate which methodology will be used. Some common objectives include:

Compliance: ensuring compliance with specific regulations, such as the LGPD and PCI-DSS (Payment Card Industry Data Security Standard).
Change validation: ensuring that a new feature or a major architectural change has not introduced new vulnerabilities.
Risk assessment: measuring the risk level of a critical application for the organization.

With the purpose and objectives well defined, the testing team can move on to the next phase, focusing on the important points.

Step 2: run tests and collect results

Here, the approaches chosen during planning are applied.

The execution must follow what was defined in Step 1, combining automated testing and manual testing as needed.

The goal of this step is data collection and documentation, because identifying a flaw is not enough.

It is important to record each finding in detail, including:

Understanding how the tester reached the flaw;
Collecting evidence, such as screenshots, request and response logs;
Checking where the risk is: in the line of code, the URL, or the affected infrastructure component;
Classifying the initial and preliminary severity of the risk.

Thus, detailed documentation determines the success of the next stages of security testing, integrating them continuously into your routine and the quality assurance of your products.

Step 3: analyze and prioritize vulnerabilities

In this step, the data collected during test execution is transformed into a strategic action plan.

Based on the information obtained in the previous stage, the team validates the identified vulnerabilities and sets fixing priorities according to the level of risk each one represents for the software and the business.

To do so, the security and development teams work together to apply analysis models, such as the Common Vulnerability Scoring System (CVSS) or OWASP (Open Worldwide Application Security Project) methodologies, classifying each vulnerability according to its criticality.

However, prioritization does not depend only on the technical score.

It is also necessary to consider factors such as operational impact, ease of exploitation, exposure of sensitive data, compliance requirements, and possible financial impacts for the organization.

This process helps companies direct technical efforts and investments toward truly critical vulnerabilities, avoiding wasting resources on problems with low operational impact.

That is why the result of this analysis goes beyond a simple list of bugs.

In practice, it works as a strategic roadmap to guide immediate fixes, preventive actions, and long-term decisions related to application protection.

In this way, prioritizing vulnerabilities contributes to more efficient risk mitigation and more intelligent management of development resources.

Step 4: mitigate and fix flaws

After the analysis and prioritization stage, the security strategy begins to be applied directly to the application's code and infrastructure.

At this point, the development and operations teams work on implementing patches, rewriting vulnerable sections, and reconfiguring infrastructure components based on the recommendations identified during the tests.

According to the DevSecOps methodology (development, security, and operations), fixing vulnerabilities should happen in an agile way and integrated into the development pipeline, avoiding the accumulation of technical problems throughout the application cycle.

It is important to understand the difference between mitigating and fixing vulnerabilities.

Mitigation consists of temporary actions aimed at reducing the impacts of cyber threats, allowing the operation to keep running while the definitive solution is implemented.

Fixing, also called remediation, eliminates the root cause of the problem through permanent adjustments to the system, the code, or the infrastructure.

This stage is only completed after the regression test is performed, which is responsible for validating whether the vulnerability was effectively eliminated and whether the changes made did not introduce new problems in the software.

In this way, the retest helps strengthen the application's stability, reduce operational risks, and increase the reliability of the production environment.

Step 5: create reports and continuous repetition

The last step transforms the collected data and the fixes into applicable knowledge.

To create the necessary reports, you need to understand the different audiences:

Technical audience: details the vulnerabilities, the steps to reproduce them, and the fixes applied (retest), serving as a roadmap for the development team.
Executive audience: presents the level of residual risk, compliance status, and security ROI (Return on Investment), enabling strategic decision-making.

Thus, security should not be seen as a goal to be reached, but as a discipline to be maintained.

After following all the steps, it is necessary to schedule the continuous repetition of security testing, given the evolution of cyber threats.

After all, the continuous approach to testing allows your application or infrastructure to remain resilient in the long term.

How to apply security testing in corporate environments?

The application of security testing varies according to the type of system, infrastructure, and level of criticality of the company's operations.

In corporate environments, these analyses help identify bugs before they affect critical applications, sensitive data, or operational continuity.

That is why organizations in different segments incorporate continuous testing to strengthen the protection of digital environments and reduce risks throughout the development cycle.

How does security testing work in financial applications?

Financial applications deal daily with sensitive data, transactions, and critical integrations, which requires a high level of protection.

In this context, security testing helps identify risks related to:

Data leakage;
Authentication failures;
Fraud;
API exposure;
Service unavailability.

In addition to reducing vulnerabilities, these analyses contribute to regulatory compliance and greater reliability of financial operations.

How do SaaS companies use continuous testing?

SaaS companies work with frequent updates, constant integrations, and highly scalable environments.

That is why testing helps to:

Identify vulnerabilities quickly;
Avoid failures in production;
Reduce technical rework;
Increase application stability;
Maintain delivery quality.

This approach strengthens security without compromising the teams' operational agility.

How to integrate security into the development cycle?

Integrating security into the development cycle means incorporating tests and validations from the earliest stages of the project.

In practice, companies adopt approaches such as DevSecOps to unite development, security, and operations in continuous analysis and fixing processes.

This makes it possible to:

Detect vulnerabilities earlier;
Speed up fixes;
Reduce operational risks;
Increase delivery predictability;
Strengthen software stability.

With this integration, security stops acting only in a corrective way and becomes part of the continuous evolution of applications.

Why is security testing the future of cybersecurity?

Throughout this article, we understood the importance of security testing for maintaining the quality and protection of your product, in addition to being the pillar of cybersecurity.

We explored the different testing approaches and how to implement them in five steps, making clear the need for constant vigilance to prevent cyber attacks.

It is not about seeking perfection, but about maintaining a cycle of continuous improvement.

In this sense, security testing is proof of your company's commitment to data protection and regulatory compliance.

By integrating recurring testing, you build a relationship of trust with your customers, mitigate financial risks, and protect your company's reputation against the digital threats we face.

Take your security testing to the next level

Want to turn security testing into a continuous strategy for protection and risk reduction for your company?

Atomic Solutions helps organizations identify vulnerabilities, strengthen applications, and structure more efficient security processes throughout the entire development cycle.

Talk to our specialists and find out how to evolve your software's cybersecurity with a more strategic, scalable approach aligned with your business needs!

Security testing: how to implement it and reduce vulnerabilities