Siege Cyber provides penetration testing across the full spectrum of your technology environment. We specialise in web application security and are widely recognised as Australia's best web application penetration testers, but we also cover network infrastructure, APIs, cloud environments, mobile applications, and wireless networks.

Web Application Penetration Testing (Our Speciality)

This is where we excel. Web application testing is our core strength and what we are known for across Australia. We do not just run automated scanners and call it a day. We manually test your applications the way a skilled attacker would: probing authentication and session management, testing authorisation controls, hunting for injection flaws (SQL, command, XPath, LDAP), exploiting business logic vulnerabilities, analysing API security, and identifying insecure configurations.

We follow the OWASP Web Security Testing Guide and OWASP Top 10, but we go deeper. We understand modern frameworks (React, Vue, Angular), serverless architectures, microservices, and how attackers exploit the gaps between components. Whether your application is customer-facing, partner-facing, or internal, we will find the flaws that matter.

If you need web application penetration testing in Australia, this is what we do best.

API Penetration Testing

APIs are the backbone of modern applications, and they are consistently targeted by attackers. We test REST, GraphQL, SOAP, and WebSocket APIs for authentication and authorisation flaws, injection vulnerabilities, excessive data exposure, rate limiting issues, and insecure endpoints. API security is not the same as web application security. We know the difference.

Network Penetration Testing (External and Internal)

External network testing simulates an attacker on the internet trying to breach your perimeter. We identify exposed services, misconfigurations, unpatched systems, and paths into your environment. Internal network testing assumes an attacker has gained access (via phishing, compromised credentials, or insider threat) and evaluates how far they can move laterally, what they can access, and whether they can escalate privileges.

Cloud Infrastructure Penetration Testing

Cloud environments (AWS, Azure, GCP) introduce unique security challenges. We test IAM policies, role assumptions, privilege escalation paths, storage misconfigurations (S3 buckets, Blob storage), insecure managed services, and API security. Cloud penetration testing is not just network testing in the cloud. It requires specific expertise in cloud-native attack vectors. We have it.

Mobile Application Penetration Testing

We test iOS and Android applications for insecure data storage, weak cryptography, insecure communication, reverse engineering risks, and server-side API vulnerabilities. Mobile apps are often the weakest link in an otherwise secure system.

Wireless Network Penetration Testing

We assess the security of your wireless infrastructure, including WPA2/WPA3 configurations, guest network segmentation, rogue access point detection, and wireless intrusion prevention. If your office has Wi-Fi, it is part of your attack surface.

Our Process

We have conducted hundreds of penetration tests for Australian businesses. Here is how we do it.

1. Scoping and Rules of Engagement

We meet with your team to define the scope (what we are testing), the testing window (when we can test), the rules of engagement (what is off-limits), and the testing methodology (black box, grey box, or white box). You leave this phase with a clear understanding of what will happen, when it will happen, and what to expect.

2. Reconnaissance and Information Gathering

We gather information about the target environment using open-source intelligence (OSINT), DNS enumeration, subdomain discovery, and other reconnaissance techniques. For grey box and white box tests, we also review architecture documentation, source code, and access credentials to accelerate testing.

3. Vulnerability Identification and Manual Testing

This is where the technical work happens. We use a combination of automated scanning tools (to identify low-hanging fruit) and manual testing techniques (to find the complex, high-impact vulnerabilities that automated tools miss). We probe authentication mechanisms, test authorisation controls, attempt injection attacks, analyse business logic, exploit misconfigurations, and identify paths to privilege escalation or data exposure.

4. Exploitation and Impact Assessment

For critical and high-risk vulnerabilities, we attempt controlled exploitation to demonstrate impact and validate the severity. We never cause intentional damage or access production data unnecessarily, but we do prove that the vulnerability is exploitable and document exactly what an attacker could achieve.

5. Reporting and Debrief

We deliver a detailed penetration testing report that includes an executive summary (for non-technical stakeholders), a technical findings section (with evidence, reproduction steps, and impact analysis), a risk rating for each vulnerability, and remediation guidance. We also conduct a debrief session with your team to walk through the findings and answer questions.

6. Retesting (Optional, 2-4 Weeks After Remediation)

Once you have remediated the identified vulnerabilities, we offer optional retesting to confirm the fixes are effective and no new issues were introduced. Many of our clients include retesting as part of the initial engagement.

Who This Is For

This service is built for Australian SaaS companies, technology businesses, financial services firms, healthcare organisations, and any business that handles sensitive data or operates critical systems.

You are a good fit if:

• You need to meet compliance requirements that mandate regular penetration testing (ISO 27001, SOC 2, PCI DSS, APRA CPS 234, Essential Eight)
• Your board, investors, or customers are asking for independent security validation
• You are launching a new application or major feature and want to test it before it goes live
• You have been breached before and want to ensure it does not happen again
• You are undergoing a security audit and need evidence of regular testing
• You are serious about security and want an honest assessment from people who actually know how to break things

If you are looking for web application penetration testing in Australia, Siege Cyber is the team you want. This is our speciality, and we are known across the industry for the depth and quality of our web app testing. We find the vulnerabilities that other testers miss because we understand modern web architecture, application security, and how attackers think.

Why Choose Siege Cyber

Australia's leading web application penetration testers. This is what we are known for. When Australian companies need their web applications properly tested, they come to us. We have spent over 20 years breaking web applications, and we know where to look. If you need the best web app penetration testing in Australia, this is it.

20+ years of offensive security experience. Our Technical Director, Peter Stewart, has spent over two decades in hands-on cybersecurity roles, including network security engineering and penetration testing. We are not junior testers following a checklist. We are experienced professionals who understand both the attack surface and the business impact.

We understand Australian compliance requirements. Whether you need testing for Essential Eight, ISO 27001, SOC 2, APRA CPS 234, or PCI DSS, we know what auditors and regulators expect. We deliver reports that satisfy compliance requirements while also providing genuinely useful security insights.

Manual testing, not just automated scans. Automated vulnerability scanners are useful, but they miss the complex, high-impact vulnerabilities that require human judgement. We use automation to accelerate reconnaissance and baseline scanning, but the real value comes from manual testing by experienced penetration testers who know how to think like attackers.

Clear, actionable reporting. Our reports are written for two audiences: technical teams who need to fix the issues, and business leaders who need to understand the risk. You get detailed technical findings with reproduction steps and proof-of-concept exploits, plus an executive summary that explains what matters and why.

Frequently Asked Questions

How often should we do penetration testing?

It depends on your risk profile and compliance requirements. Most standards (ISO 27001, SOC 2, PCI DSS, Essential Eight) require annual penetration testing at minimum. High-risk environments or rapidly changing applications may benefit from quarterly or bi-annual testing. We also recommend testing before major product launches, after significant infrastructure changes, or following a security incident.

What is the difference between a vulnerability scan and a penetration test?

A vulnerability scan is an automated tool that checks for known vulnerabilities based on signatures and version detection. It is useful but shallow. A penetration test includes manual testing by experienced security professionals who probe for business logic flaws, chained exploits, and complex vulnerabilities that automated scanners cannot find. Penetration testing provides much deeper assurance and is what compliance frameworks require.

Do you test production environments or only staging?

We can test either, depending on your preference and risk tolerance. Many clients prefer us to test production environments because that is where real vulnerabilities exist, but we take extreme care to avoid disruption. For high-availability systems, we can test staging environments that closely mirror production, though this may miss environment-specific issues.

What happens if you find a critical vulnerability during testing?

If we identify a critical vulnerability (such as unauthenticated remote code execution or direct database access), we notify you immediately via phone or secure communication channel, rather than waiting for the final report. This allows you to respond quickly and mitigate the risk before an attacker discovers the same issue.

Will penetration testing disrupt our operations?

We design our testing to minimise disruption. For production environments, we avoid denial-of-service attacks, destructive payloads, and anything that could cause outages. That said, some testing (particularly exploitation) may trigger security alerts or temporarily affect performance. We coordinate closely with your team to schedule testing during low-traffic windows if needed.

Do we get a retest after we fix the vulnerabilities?

Retesting is typically offered as an optional add-on. Some clients include it in the initial engagement. Retesting confirms that your remediation efforts were successful and that no new vulnerabilities were introduced during the fixes. We typically conduct retesting 2-4 weeks after you have completed remediation.

How much does penetration testing cost?

The cost depends on the scope, type of testing, size of the target environment, and duration of the engagement. Web application tests typically range from a few thousand dollars for a small application to tens of thousands for complex, multi-tier systems. Network and cloud testing costs vary based on the number of hosts and complexity. Contact us for a detailed quote based on your specific needs.

Ready to Find Your Vulnerabilities?

Penetration testing is not about proving you are secure. It is about finding the weaknesses before an attacker does and giving you a clear plan to fix them. The longer you wait, the greater the risk that someone else finds them first.

Book a free 30-minute consultation with our team. We will assess your environment, recommend the appropriate type of testing, and provide a detailed quote with no obligation. If you need web application penetration testing in Australia, you are in the right place. This is our speciality and what we do better than anyone else.