Security testing helps organisations identify weaknesses in applications, systems, and networks before attackers can exploit them. It is an important part of a wider cybersecurity programme, especially as applications become more complex and organisations rely on APIs, cloud services, open-source software, and AI.

The financial impact of missing these weaknesses can be significant. IBM’s 2026 Cost of a Data Breach Report found that the average cost of a data breach in India was INR 255 million (₹25.5 crore), while offensive security testing, such as penetration testing and red teaming, reduced breach costs by an average of ₹2.47 crore.

Different testing methods look for different types of weaknesses, which is why organisations often combine automated tools with manual testing.

What Is Security Testing?

Security testing is the process of checking software, systems, and networks for vulnerabilities that could allow unauthorised access, data exposure, or misuse.

Unlike functional testing, which checks whether a feature works correctly, security testing asks a different question:

Security testing can include:

• Vulnerability scanning.
• Penetration testing.
• Application security testing.
• API security testing.
• Mobile application testing.
• Source code analysis.
• Software composition analysis.
• Cloud security testing.

What Are the Main Types of Security Testing?

Security testing covers different methods, with each one focusing on a specific part of an organisation’s technology environment. Here are some of the most common security testing types and what each one helps identify:

Vulnerability Scanning

Vulnerability scanning uses automated tools to identify known vulnerabilities, outdated components, and common security weaknesses.

It is useful for regular monitoring and broad coverage, but it may not understand application-specific business logic or complex attack paths.

Penetration Testing

Penetration testing combines automated tools with manual testing to identify and validate vulnerabilities.

Testers attempt to exploit identified weaknesses within an agreed scope to understand what an attacker could actually achieve.

Application Security Testing

Application Security Testing, or AST, covers different techniques used to identify security weaknesses in software throughout its development and testing lifecycle.

It can include SAST, DAST, IAST, SCA, and manual penetration testing.

API Security Testing

API security testing checks whether APIs properly protect authentication, authorisation, data, and business functions.

This is particularly important because APIs often provide direct access to application data and functionality.

Security Auditing

A security audit takes a broader view of security controls, policies, processes, and compliance requirements.

Unlike penetration testing, an audit is not primarily focused on exploiting vulnerabilities. It checks whether appropriate controls exist and are being followed.

Risk Assessment

A security risk assessment identifies potential threats and evaluates their likelihood and impact.

It helps organisations prioritise security investments instead of treating every security issue as equally important.

SAST, DAST, IAST and SCA: What Do They Mean?

Application security tools use different approaches to examine software. Understanding these differences helps organisations choose the right tools for their development and security processes.

Testing Type	How It Works	Best Used For
SAST	Analyses source code without running the application.	Finding coding-level security issues early in development.
DAST	Tests a running application from the outside.	Finding runtime and configuration vulnerabilities.
IAST	Analyses an application from inside while it is running.	Finding vulnerabilities during testing with more application context.
SCA	Checks third-party and open-source components for known vulnerabilities.	Identifying risks in software dependencies.
MAST	Applies security testing techniques to mobile applications.	Testing Android and iOS applications.

These tools complement each other rather than replace one another. A development team may use SAST during coding, SCA when dependencies change, DAST in a test environment, and manual penetration testing for deeper validation.

Security Testing Examples

The type of weakness found often depends on the testing method being used.

For example:

• SAST may identify code that creates a potential SQL injection vulnerability.
• DAST may identify a cross-site scripting issue in a running application.
• SCA may identify a vulnerable third-party library used by the application.
• API testing may find that one user can access another user’s information by changing an object ID.
• Manual penetration testing may identify a business logic flaw that requires several steps to exploit.

This is why relying on one automated security tool can leave important gaps.

Where Automated Security Testing Has Limitations

Automated tools can test large environments quickly and run regularly, making them useful for identifying known and repeatable vulnerabilities. However, they may not detect issues that depend on application-specific business logic, user roles, or complex attack paths.

For example, a scanner may identify an API endpoint but fail to recognise that changing an account ID allows one customer to access another customer’s invoice. Manual testing can uncover such issues by understanding the application’s design and testing realistic attack scenarios.

This is why a mature security programme combines automation for broad coverage with manual testing for deeper validation.

How to Build a Practical Security Testing Approach

A practical security testing programme should be based on the organisation’s risk rather than applying every available test to every system.

Consider these factors when deciding the testing approach:

• Applications handling sensitive information.
• Internet-facing systems.
• Business-critical applications.
• APIs connected to external systems.
• Applications that change frequently.
• Systems subject to regulatory or customer requirements.

Automated testing can provide regular coverage, while deeper manual testing can be scheduled based on risk and the frequency of application changes.

For example, a high-risk customer-facing application may need regular vulnerability scanning, automated application security testing, and periodic penetration testing.

Security Testing Support From CyRAACS

A strong security testing programme needs the right mix of automated testing, manual assessment, and follow-up. CyRAACS supports organisations across this process through its VAPT services, covering applications, APIs, mobile applications, networks, and cloud environments.

Depending on the scope and risk, the assessment can include:

• Vulnerability assessment and penetration testing.
• Web application and API security testing.
• Mobile application security testing.
• Cloud security assessments.
• Manual vulnerability validation.
• Remediation guidance and retesting.

For organisations that need regular testing as their applications and attack surface change, Managed VAPT provides scheduled assessments, remediation tracking, retesting, and security trend reporting.

This approach helps organisations move beyond one-time testing and maintain better visibility into their security posture over time.

Wrapping Up

Security testing helps organisations identify and validate weaknesses before attackers can exploit them. But no single testing method can provide complete coverage.

Automated tools such as SAST, DAST, and SCA are useful for regular and scalable testing, while manual penetration testing helps identify application-specific vulnerabilities, business logic issues, and complex attack paths.

The most effective approach is to combine the right testing methods based on the organisation’s technology, risk, and business requirements and to retest important findings after remediation.

FAQs

1. What is security testing?

Security testing is the process of identifying and validating vulnerabilities in applications, systems, networks, and other technology environments.

2. What are the main types of security testing?

Common types include vulnerability scanning, penetration testing, application security testing, API testing, security auditing, and risk assessment.

3. What is the difference between SAST and DAST?

SAST analyses source code without running the application, while DAST tests a running application from the outside.

4. Is automated security testing enough?

No. Automated tools are useful for broad and regular coverage, but manual testing is often needed to identify business logic flaws, complex attack paths, and application-specific vulnerabilities.

5. How often should security testing be performed?

The frequency depends on the system’s risk and how often it changes. Testing should also be considered after major application, infrastructure, or integration changes.

6. Does penetration testing include retesting?

A thorough engagement should include retesting after remediation to confirm that identified vulnerabilities have been properly fixed.