What 24,817 Bug Bounty Reports Reveal About Real-World Hacking

Credit: MrFreakyclown

Bug bounty hunting is often portrayed as a world of advanced exploitation techniques, sophisticated attack chains, and powerful hacking tools. Spend enough time watching cybersecurity videos or reading hacking forums, and you might believe that finding vulnerabilities requires an enormous collection of tools and knowledge of the latest exploits.

But what happens when we look at real-world vulnerability reports instead of theoretical attacks?

An analysis of 24,817 real-world vulnerability reports submitted to bug bounty programs reveals some interesting insights into what security researchers actually find.

The results challenge some common assumptions about bug bounty hunting. The most prominent vulnerability category is not an obscure, newly discovered exploit. It is cross-site scripting (XSS), a vulnerability that has existed for decades.

Even more surprisingly, the most frequently mentioned tool in the reports is reportedly curl, a simple command-line utility for making HTTP requests.

These findings highlight an important lesson for anyone learning bug bounty hunting: understanding the fundamentals is often more valuable than collecting advanced tools.

Cross-Site Scripting Still Leads

According to the analysis, cross-site scripting accounts for nearly 12% of the 24,817 reports examined.

That is almost one in every eight reports.

XSS has been a familiar web application vulnerability for decades, yet it continues to appear in real-world applications. Despite improvements in web development frameworks, security libraries, and development practices, mistakes in handling untrusted input remain a problem.

Cross-site scripting occurs when an application handles untrusted content in a way that allows attacker-controlled JavaScript to execute in another user's browser.

These vulnerabilities can arise when applications render user input unsafely, fail to encode output correctly, or process data in ways that allow malicious scripts to execute.

For bug bounty hunters, this is an important reminder: familiar vulnerabilities are still worth investigating.

There is no requirement to discover a completely new attack technique to find a valid security issue. Companies continue to pay researchers for identifying vulnerabilities that developers have overlooked.

If you are starting your bug bounty journey, do not skip XSS simply because it seems old or common. Learn how it works, understand the different types, and practice identifying the conditions that make it possible.

Sometimes, the most valuable opportunities are found in vulnerabilities that everyone already knows about.

The Most Frequently Mentioned Tool Is curl

Another interesting finding concerns the tools mentioned in the reports.

Cybersecurity content often introduces beginners to an enormous collection of tools: reconnaissance frameworks, subdomain enumeration utilities, automated scanners, exploitation frameworks, and AI-powered security tools.

With so many options available, it is easy to assume that successful bug bounty hunters need dozens or even hundreds of tools installed before they can begin testing.

However, the analysis identifies curl as the most frequently mentioned tool in the reports.

curl is a command-line utility that allows users to transfer data using protocols such as HTTP and HTTPS. It is widely available and can be used to send requests, inspect responses, and reproduce application behavior.

Why is this significant?

When researchers report a vulnerability, they often need to demonstrate exactly what happens when a particular request reaches a server. A simple HTTP request may be enough to reproduce the problem.

For example, a researcher might change a parameter, modify a request header, remove a value, or send a request with unexpected input to observe how the application responds.

curl is useful for these tasks because it provides direct control over HTTP requests without requiring a complicated graphical interface.

However, there is an important limitation to the finding: a tool being mentioned frequently in vulnerability reports does not necessarily mean it is the most frequently used tool overall. Researchers may use many tools during reconnaissance and testing but mention only curl when documenting the steps needed to reproduce a vulnerability.

Even with that limitation, the finding reinforces the value of understanding HTTP and learning how to work with requests directly.

Understanding the Technology Matters More Than the Tool

One of the most important lessons from the analysis is that tools do not replace technical understanding.

A person who understands HTTP can use curl to investigate application behavior effectively. Someone who understands web application architecture can use Burp Suite to intercept, modify, and analyze requests.

But simply installing these tools does not automatically make someone a better security researcher.

The real skill lies in understanding what happens beneath the interface.

A bug bounty hunter needs to understand how requests are processed, how authentication works, how sessions are managed, and how the application determines what a user is allowed to do.

Without that knowledge, even advanced tools can become little more than collections of buttons and automated checks.

Rather than installing hundreds of tools without understanding them, beginners should focus on learning HTTP and becoming comfortable with a small number of essential utilities, particularly curl and Burp Suite.

Once the fundamentals are clear, these tools become significantly more useful.

Ordinary Vulnerabilities Can Lead to Valuable Findings

The analysis also highlights the importance of vulnerabilities beyond XSS.

Authentication problems, access control issues, and information disclosure remain relevant areas for security testing.

These vulnerabilities often emerge when researchers examine how an application behaves under unexpected conditions.

Consider a few questions a bug bounty hunter might ask while testing an application they are authorized to assess:

• What happens if I change an object ID in a request?
• Can another user access information that should belong only to me?
• What happens if I remove a parameter from a request?
• Does the application enforce permissions on the server, or does it rely only on the interface?
• What happens if I send an unexpected value to an endpoint?

These questions are simple, but they can reveal serious weaknesses.

For example, an application might display only a user's own invoices in its interface while failing to verify ownership when an invoice is requested directly through an API. If changing an identifier allows access to another user's invoice, the issue may indicate broken access control.

Similarly, an application might authenticate users correctly but fail to check whether they have permission to perform a particular action.

In both cases, the researcher does not necessarily need an advanced exploitation framework. They need to understand the application's intended behavior and recognize where its actual behavior differs.

That is a fundamental part of security testing.

Why Beginners Often Approach Bug Bounty Hunting Backwards

Many beginners start by collecting tools, downloading payload lists, learning vulnerability names, and installing automated scanners.

These activities can be useful, but they become less effective when they replace understanding.

A scanner might identify a potentially interesting response, but the researcher still needs to determine whether it represents a genuine vulnerability.

A payload might produce an unexpected result, but the researcher needs to understand why that result occurred and whether it creates a security risk.

A reconnaissance tool might discover an endpoint, but the researcher needs to understand what the endpoint does and whether it enforces the correct permissions.

This is why learning the fundamentals first makes sense.

Instead of focusing on how many tools you have installed, focus on how well you understand the application you are testing.

Learn how it handles requests, processes input, authenticates users, and enforces authorization. Then use tools to investigate specific questions and validate your observations.

The goal is not to use the most tools. The goal is to identify real security weaknesses and demonstrate them clearly.

You Do Not Need to Discover a New Vulnerability Class

Another important takeaway is that successful bug bounty hunting does not require inventing a new vulnerability.

XSS has existed for decades. SQL injection has existed for decades. Authentication weaknesses and access control problems are also well-known categories of security issues.

Yet organizations continue to overlook these vulnerabilities.

That is because every application has its own implementation, configuration, business logic, and security assumptions. A vulnerability class may be familiar, but the specific mistake that makes an application vulnerable can still be unique to that application.

Bug bounty hunting is therefore not simply about discovering new techniques. It is about finding weaknesses that exist in the systems being tested.

The most useful question is often not, "What is the newest vulnerability?"

It is, "What is this application supposed to do, and what happens when I make it behave differently?"

That shift in thinking can help researchers focus on practical security issues instead of chasing every new tool or attack technique.

A Practical Learning Path for Beginners

Based on the lessons highlighted in the analysis, beginners can focus on a few core skills before expanding into more advanced techniques.

1. Learn HTTP fundamentals.

Understand requests and responses, methods, headers, status codes, cookies, sessions, and query parameters. Learn how browsers and servers communicate.

2. Become comfortable with curl.

Practice sending HTTP requests, modifying headers, supplying parameters, and examining server responses. Use it to reproduce behavior in systems you are authorized to test.

3. Learn Burp Suite.

Understand how to intercept requests, modify parameters, inspect responses, and compare application behavior under different conditions.

4. Study XSS properly.

Learn reflected, stored, and DOM-based XSS. Understand browser behavior, output encoding, and the contexts in which untrusted input can become executable code.

5. Understand authentication and authorization.

Learn the difference between proving who a user is and determining what that user is allowed to do. Study session handling, role-based permissions, and access control failures.

6. Practice manual request manipulation.

Ask what happens when a parameter changes, an identifier is modified, a request is sent as another authorized test account, or an unexpected value is supplied. Observe the results and determine whether the application behaves securely.

7. Use automated tools to support your understanding.

Scanners and reconnaissance frameworks can help identify potential issues, but learn to validate their findings rather than relying on automated results alone.

Always test within the scope and rules of the relevant bug bounty program.

Final Thoughts

The analysis of 24,817 vulnerability reports offers a valuable reminder about the realities of bug bounty hunting.

According to the presentation, XSS accounts for nearly 12% of the reports, while curl is the most frequently mentioned tool. Other recurring issues include authentication problems, access control weaknesses, and unintended information exposure.

These findings suggest that effective security research does not always depend on sophisticated exploitation techniques or an enormous collection of tools.

It depends on understanding how applications work, asking the right questions, manipulating requests carefully, and recognizing when an application behaves in a way that creates a security risk.

If you are beginning your bug bounty journey, start with HTTP. Learn curl and Burp Suite. Understand XSS, authentication, and authorization. Practice examining application behavior manually before relying heavily on automated scanners.

You do not need hundreds of tools to become a better bug bounty hunter. You need a strong understanding of the technology, the ability to think critically, and the patience to investigate what others have overlooked.

Sometimes, the fundamentals are exactly where the most important discoveries begin.