Although it appears that data security is relevant only to large corporate entities with dedicated security teams, the reality is different.
Startups are also vulnerable to data breaches and medium-sized websites are targeted by cyber-attacks. Even teams with web scanning tools but lacking proper penetration testing capabilities are under threat.
This guide explains what security testing involves, identifies the different methods and tools required to understand and address them effectively, and provides a practical checklist to get you started.
Whether you are a developer, a Quality Assurance (QA) Manager, or want to understand the level of security risks involved before launching any product, this piece is sure to offer some value.
What Is Security Testing?
Security testing in software testing refers to the process of deliberately exploring your application, infrastructure, and APIs to identify vulnerabilities before cyber-attackers can. The goal is simple: identify bugs in code, configuration, access controls, and dependencies that could lead to vulnerabilities under realistic conditions.
Done well, security testing offers more than just listing bugs. It provides detailed reports on weaknesses with severity levels, enabling your team to focus on areas of concern and providing the necessary guidelines to address the identified weaknesses.
Security testing is an ongoing activity; as the threat landscape evolves, so too does our codebase, and so should your testing strategy. If your team needs help to carry out security testing effectively, TestPapas offers QA and security testing services that integrate seamlessly with your existing workflow.
Types of Security Testing
No single method catches everything. Honestly, most people don't realize how layered this actually is. Different approaches focus on different parts of your system, and they each tell you something slightly different. Here's the gist of what each type does, and why it might matter to you.
Vulnerability Scanning
These are the automated tools that sweep through your system looking for the usual suspects: outdated libraries, open ports, and misconfigured settings. It's fast, which is nice, and it covers a lot, so you can run it regularly. But here's the thing: it's noisy; you'll get alerts that don't really matter, and someone actually has to look at them to figure out what's real. We consider this as a first step, not the whole story.
Security Scanning
Security scanning digs a little deeper. It looks at your network, your application code, and even how your setup might make something exploitable. So, it's broader than vulnerability scanning, and in many cases, the results feel more actionable. Still, it's not perfect; some things only appear under real-world pressure.
Penetration Testing
Here, a tester actively tries to break in. They poke at your defenses, try to escalate privileges, and see how far they can get once past your walls. It's the closest thing to a real attack, and it often uncovers chained vulnerabilities, little problems that by themselves aren't catastrophic but together could be dangerous.
Application Security Testing (AST)
AST is the umbrella term covering SAST, DAST, IAST, and MAST. Basically, it's about the software itself, how well the code holds up, how the app behaves when you throw odd inputs at it, and whether it handles edge cases gracefully. Most teams spend most of their time here, and to be fair, it makes sense. That's where a lot of the real risk lives.
API Testing
APIs are tricky since they expose sensitive data and business logic, and often, they're not tested enough. API security testing looks at authentication failures, broken object-level access controls, overexposed data, and missing rate limits. For FinTech platforms or anyone handling payments, messing this up could lead to a serious problem down the line.
Risk Assessments
These aren't about finding one bug. Instead, you step back and map out what could go wrong, how likely it is, and what the business impact might be. It gives you perspective, and that perspective guides your priorities. Where do you start testing? Which bugs do you fix first? Where does the budget go? Risk assessment gives you the framework for those decisions.
Ethical Hacking
Ethical hackers are the people who think like attackers, but legally. They try everything: social engineering, network exploits, application attacks, sometimes even physical access attempts. The findings are usually the most revealing because they reflect how an attacker might chain together different flaws. We strongly recommend that every company should at least try this once; it's eye-opening.
Network Security Testing
Network testing is all about infrastructure: firewalls, routers, VPNs, DNS, and internal segmentation. Even if your app is solid, a weak network layer can undo everything. Poor segmentation, for instance, can let attackers move sideways once they're in, hitting systems you thought were safe. It's one of those "most people forget it until it's too late" situations.
Security Posture Assessments
Instead of looking for a single bug, this checks the maturity of your whole security program. Policies, tools, practices, and technical controls are all examined. The question isn't "what's broken?" but "how prepared are we?"
Shift-Left Testing
Shift-left is about catching security issues early, during code review or CI/CD, rather than waiting until pre-launch. It's faster, cheaper, and gradually builds awareness across the team. A bug caught before it hits the main codebase is way easier to fix than something that pops up in production.
Types of Security Testing Tools
No security tool is a one-size-fits-all, and that's kind of the point. They're designed for different moments in the development process. Pick the wrong one for where you are, and you'll spend more time filtering out junk results than actually fixing anything. Here's a breakdown of what each tool category does and when it's actually worth using.
SAST (Static Application Security Testing)
SAST tools read through your code before it ever runs. You wire them into your CI/CD pipeline, and they flag things like hardcoded passwords, SQL injection patterns, or calls to known dangerous functions, all before a single line hits a server. Sounds ideal, right? The catch is noise. SAST tools are notorious for false positives, especially on larger codebases. Teams that don't tune them end up drowning in warnings, and eventually, people start ignoring the alerts entirely.
DAST (Dynamic Application Security Testing)
Where SAST reads code, DAST actually hits a running version of your app. It feeds it weird inputs, simulates attack traffic, and watches how the application responds. Runtime issues, things that only exist when the app is live and under pressure, are what DAST is designed to find. The most common limitation teams run into is coverage: if your app has complex authentication flows or pages that only load after several user interactions, DAST will struggle to reach them without extensive manual setup.
IAST (Interactive Application Security Testing)
IAST is the one people are often least familiar with. Instead of scanning code or hammering your app from outside, it sits inside the application itself, instrumented at the runtime level, and watches what's happening as your tests run. Because it has that inside view, it produces far fewer false positives. It knows the actual execution context, so it's not guessing whether something is exploitable the way SAST often is.
MAST (Mobile Application Security Testing)
MAST exists because mobile apps have their own unique set of risks, ones that SAST and DAST aren't really built to handle; Insecure local data storage, broken certificate pinning, weak cryptography implementations, improper session handling. These are mobile-specific problems that need mobile-specific testing. It covers both iOS and Android, and if your product ships on either platform, especially in a regulated industry, MAST should be part of your release process, not an afterthought.
SCA (Software Composition Analysis & Supply Chain Testing)
Here is a question that not many teams ask often enough: Do you know what's in your dependencies? Not just the libraries that you are importing, but what's inside the libraries, what they import and whether any of them contain any known vulnerabilities? Software Composition Analysis (SCA) tools identify your third-party libraries and Open Source components and check them against databases of known CVEs. It also identifies licensing issues, an important aspect if you are developing a commercial application.
RASP (Runtime Application Self-Protection)
RASP stands out from all the items listed here. It is not a testing tool; it is a live web application firewall running within your production application.
It provides real-time monitoring of what the web application does and takes action when it detects any kind of malicious activity. An SQL Injection was attempted during a request? RASP can stop it before it reaches the Database Server without requiring any patch deployment.
Security Testing Checklist (By Category)
Category | Check | Details / Notes |
|---|---|---|
Authentication and Session Management | MFA enforcement | Multi-factor authentication is required for admin panels and sensitive account actions |
Password policies | Enforce complexity and check against known breached password lists | |
Session token security | Tokens are unpredictable, long enough, and rotated after login | |
Session expiration | Sessions expire after inactivity and are fully invalidated server-side on logout | |
Cookie security | Cookies are flagged as Secure, HttpOnly, and SameSite | |
Server-side token validation | Client-supplied roles or session data are never trusted; validation occurs server-side | |
Authorization and Access Control | Role-based access | Role-based checks are enforced on every server-side endpoint, not only in the frontend |
Object-level authorization | Changing an ID in a request should not expose another user’s data | |
IDOR & BOLA testing | Explicit testing of Insecure Direct Object References and Broken Access Control patterns | |
Least privilege enforcement | Accounts and services only have the permissions they need | |
Admin access restriction | Admin functionality is unreachable to standard users, even via direct URLs | |
Input Validation and Injection | SQL injection | Parameterized statements or prepared queries are used throughout; no raw concatenation |
Command injection | User input never passed directly to shell commands | |
SSRF protection | Outbound requests are validated and restricted to an allowlist | |
Template injection | Rendering engines don’t process raw user input | |
Server-side input validation | All inputs validated server-side; client-side validation alone is not sufficient | |
Output encoding | Applied before user-supplied content renders in the browser | |
Web App Security Basics | XSS protection | User content is properly escaped before rendering |
CSRF protection | State-changing requests require valid anti-CSRF tokens | |
CORS policy | Restrictive CORS rules; no wildcard origin on authenticated endpoints | |
Clickjacking protection | Use X-Frame-Options or CSP frame-ancestors | |
Security headers | Correctly configured: CSP, HSTS, X-Content-Type-Options | |
File upload security | Restrict uploads by type and size; scan before storage | |
Data Protection and Privacy | Data encryption | Sensitive data encrypted at rest and in transit (TLS 1.2 minimum, TLS 1.3 preferred) |
PII handling | Identify, classify, and handle personal data according to privacy regulations | |
Logging practices | Logs do not contain passwords, card numbers, or sensitive identifiers | |
Retention policies | Ensure data that should be removed is permanently deleted, not just hidden | |
Backup security | Backups are encrypted; access is logged and restricted | |
Configuration, Secrets, and Environment Hardening | Debug & verbose info | Debug mode, verbose errors, and stack traces disabled in production |
Admin/internal access | Admin interfaces and internal endpoints are not publicly reachable | |
Secrets management | Credentials and secrets stored in a secure vault, never hardcoded or in version control | |
Key rotation | Key rotation is scheduled and practiced | |
TLS certificates | Certificates are valid and use strong cipher suites | |
Default credentials | All default credentials on infrastructure components have been changed | |
Dependencies and Supply Chain | Dependency scanning | Dependencies are scanned regularly and patched when CVEs are published |
Package version control | Package versions pinned in production builds | |
SBOM maintenance | Software Bill of Materials is maintained and reviewed during releases | |
Package provenance | Verified, especially for recently transferred or newly published packages | |
Monitoring and Incident Readiness | Audit logs | Cover authentication events, admin actions, and data access or exports |
Alerting | Configured for anomalous activity, failed logins, and unusual API usage | |
Anomaly detection | Tuned to normal traffic baselines to reduce noise and false positives | |
Incident response | Playbooks exist and are tested before actual incidents occur |
Benefits of Security Testing
Discovering issues early on is significantly more economical than dealing with them after your software has gone live. A bug discovered during the development of your application can be fixed, but a data breach when your software is already live can lead to inquiries, media coverage, loss of customers and several months of additional work.
In financial institutions, payment services, or online gaming platforms, where data is sensitive and laws are stringent, the need for robust security measures is massive.
Security also builds trust, as most customers want to know their personal information and payment details are safe.
Companies that show strong security practices earn that trust faster. And they keep it, even when other companies in the industry have problems and customers start asking who they can trust with their data.
Security Testing Goals
Most people think of security testing as one thing: find the bugs, fix the bugs, but in practice, there are several things happening at once, and understanding which goals matter most for your situation changes how you approach the whole program.
Finding Vulnerabilities Before Someone Else Does
This one's obvious, but it's worth saying out loud: the goal is to see your weaknesses before an attacker does. When your team finds a critical flaw in a test environment, you control the timeline. You open a ticket, you fix it, you move on. Nobody outside the company knows it exists. Compare that to finding out through a fraud alert, a customer complaint, or a regulatory notification. The vulnerability might be identical, but the situation is completely different. One version costs you a day of developer time. The other can cost you weeks of crisis management.
Meeting Compliance Requirements
Regulations like PCI DSS, GDPR, and various gambling authority licensing frameworks don't just ask whether you have security policies. They increasingly want evidence that those policies are tested and working; your test results, your remediation records, your penetration test reports, that's what auditors actually look at. This shifts security testing from a purely technical activity to a business one. For companies in financial services or online gaming, especially, documented test coverage isn't optional. It's part of operating legally.
Building Knowledge Over Time
Every testing cycle teaches your team something. Which parts of your codebase tend to have the same class of issue? Where your monitoring has blind spots. How developers instinctively handle edge cases. That knowledge doesn't disappear when the test is over; it shapes how people build things going forward.
Conclusion
Security testing doesn't make headlines. It's not the part of software development that gets celebrated at launch. But it's the thing that determines whether your platform is still standing next year, and whether your users still trust it.
The approach doesn't have to be overwhelming. Get the right types of testing in place for your environment. Use the tools that fit your development stage. Work through the checklist so the fundamentals are covered before anything ships. Build from there.
If you want to talk through where to start, reach out to the TestPapas team. They help iGaming and FinTech teams build security testing programs that fit their actual setup, not just a template.
Frequently asked questions
Quick answers to the questions readers ask most often.
- SAST reads your code before it runs. It is useful for catching security issues early in development, especially things like insecure coding patterns, hardcoded secrets, and common injection risks. That makes it a strong fit for code review and CI/CD workflows. DAST works differently. It tests a live application from the outside, much like an attacker would, and looks at how the system behaves in real conditions. This helps uncover runtime issues, configuration weaknesses, and problems that only appear when the app is actually running.
- Security testing should run on a schedule that matches how often your product changes. For most modern teams, SAST and DAST should be built into the CI/CD pipeline so they can run automatically during development and deployment. That helps teams catch issues before they pile up. Vulnerability scanning should happen at least once a month, and also after major updates, new integrations, or infrastructure changes.
- Yes. Automated scanners are useful, but they only go so far. They are good at finding known patterns, outdated components, and common weaknesses. What they usually miss are business logic flaws, chained vulnerabilities, and edge-case problems that depend on how real users interact with the system. A penetration tester approaches the application like an attacker would. They test assumptions, look for unusual paths, and see how small weaknesses can combine into a serious issue.
- Small teams should start with the controls that reduce the most risk quickly. Authentication, access control, and input validation usually deserve the most attention first because weaknesses in those areas often lead to the most serious issues. Make sure login systems are secure, roles are enforced on the server side, and user input is validated properly before it reaches sensitive parts of the application. After that, add SAST to the development pipeline so you can catch insecure coding patterns early without creating extra manual work.
- False positives become a problem when teams start seeing security tools as noise instead of help. The first step is tuning. Most tools need to be adjusted to fit your codebase, framework, and risk level. If you leave them on default settings, you will often end up with too many low-value alerts. Suppressing known non-issues and refining rule sets makes a real difference. It also helps to route findings to people who understand the application, not just to a general queue where alerts pile up without context. IAST can reduce false positives because it evaluates what is happening during execution rather than guessing from static patterns alone.
Written by
Andrew ShassetzContent Writer at TestPapas
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