Supply chain risk in Australia has moved from a niche concern to a board-level issue. Australian organisations now depend on a dense web of software vendors, managed service providers, cloud platforms and open-source components, and every one of those dependencies is a potential path in. Attackers understand this well, because compromising a single trusted supplier can deliver access to many downstream victims at once. The result is that your security is no longer defined only by your own controls but by the weakest link in everything you rely on.
This guide explains what supply chain and third-party risk look like in 2026, from vulnerable software components to compromised build pipelines and managed service providers, and how Australian organisations can assess and test their exposure rather than trusting to questionnaires alone.
Why the Supply Chain Is Such an Attractive Target
The economics of supply chain attacks are compelling for adversaries. Instead of attacking hundreds of organisations individually, an attacker can compromise one supplier that serves them all. That efficiency, combined with the trust organisations place in their vendors, makes the supply chain a favoured route.
The risk takes several distinct forms:
- Vulnerable or malicious software components embedded in the applications you use.
- Compromised software updates or build pipelines that deliver tampered code.
- Managed service providers whose privileged access becomes a bridge into your environment.
- Cloud and platform dependencies that concentrate risk in shared infrastructure.
- Contractual and regulatory obligations that flow security requirements up and down the chain.
Each of these deserves specific attention, because the controls that address one do little for the others.
Third-Party and Vendor Risk
Most organisations manage vendor risk through questionnaires and contracts, and while these are necessary, they describe intent rather than reality. A vendor can attest to strong controls and still be breached, and the questionnaire will not tell you what an attacker could reach through that vendor's access.
Effective vendor risk management in 2026 involves:
- Maintaining an inventory of suppliers and the data and access each one holds.
- Prioritising vendors by the impact a compromise would cause, not by contract value.
- Setting security expectations in contracts, including notification and audit rights.
- Validating critical vendor relationships with technical assessment, not just paperwork.
The organisations that manage this well treat vendor risk as a living program tied to real exposure, rather than an annual compliance exercise.
Software Supply Chain and SBOMs
Modern applications are assembled rather than written from scratch, drawing on large numbers of open-source and third-party components. That efficiency comes with inherited risk, because a vulnerability in a widely used component ripples through every application that depends on it. When a serious flaw in a common library emerges, the first question every organisation asks is whether they are affected and where.
A software bill of materials, or SBOM, answers that question. It is an inventory of the components and dependencies that make up a piece of software, and it enables:
- Rapid identification of affected systems when a component vulnerability is disclosed.
- Better decisions about which suppliers and applications carry the most inherited risk.
- Clearer conversations with vendors about what their products actually contain.
Increasingly, Australian buyers are asking suppliers for SBOMs, and suppliers who can provide them stand out. Even where a formal SBOM is not available, understanding your dependency exposure is essential to managing software supply chain risk.
CI/CD and Build Pipeline Compromise
The systems that build and deploy software have become a prime target, because a compromise there can inject malicious code into legitimate software before it ever reaches customers. Continuous integration and delivery pipelines are powerful and highly privileged, which is exactly what makes them attractive.
Attackers target pipelines through:
- Stolen developer credentials and access tokens.
- Secrets left exposed in code repositories or configuration.
- Malicious dependencies pulled in automatically during the build.
- Weak access controls on the build and deployment systems themselves.
Securing the pipeline means protecting credentials and secrets, controlling who can change build configuration, verifying the integrity of dependencies, and monitoring the process for anomalies. For organisations that build their own software, testing the pipeline is now as important as testing the finished application.
Managed Service Provider Risk
Many Australian organisations rely on managed service providers for IT, security and cloud operations, and those providers typically hold privileged, remote access to deliver their services. That access is a double-edged sword. It lets the provider do its job, but it also means that compromising the provider can open a path into every client it serves.
Managing this risk requires:
- Scrutinising the provider's own security posture before and during the relationship.
- Limiting provider access to only what is required, and removing standing access where possible.
- Monitoring and logging provider activity so misuse is visible.
- Testing what a compromised provider connection could actually reach in your environment.
The trust placed in a provider should be matched by the scrutiny applied to it, particularly where that provider can reach your most sensitive systems.
Regulatory Flow-Down and the SOCI Act
Supply chain security is increasingly written into Australian regulation. The Security of Critical Infrastructure Act requires responsible entities to manage material risks across several hazard domains, including supply chain hazards, as part of their Risk Management Program. This obligation does not stay with the critical infrastructure operator; it flows down to suppliers through contracts and expectations.
The practical effects are worth understanding:
- Critical infrastructure operators pass security requirements to their suppliers.
- Organisations that supply those operators inherit obligations even if the Act does not cover them directly.
- Demonstrable security, including testing evidence, becomes a condition of doing business.
Knowing where you sit in these chains helps you anticipate the requirements that will be passed to you and prepare for them rather than scrambling when a contract demands proof.
How to Assess and Test Third-Party Exposure
The common thread across every category above is that assurance must be evidence-based. A questionnaire tells you what a supplier claims; testing tells you what an attacker could achieve. A sound approach combines governance with technical validation.
Start with the fundamentals:
| Step | What it delivers |
|---|---|
| Map suppliers, access and data | A clear picture of where third-party risk concentrates |
| Prioritise by impact | Focus on the relationships that matter most |
| Apply contractual controls | Security expectations, notification and audit rights |
| Test the exposure | Evidence of what a compromise could actually reach |
Technical testing is where the picture becomes concrete. A penetration test of externally facing systems and inherited components surfaces the vulnerabilities you carry from vendors. Red teaming tests how far a realistic attacker could move if they entered through a trusted third-party connection, and how quickly you would notice. And if a supplier compromise does reach you, a rehearsed incident response capability is what limits the damage and meets any reporting obligations.
Turning Dependency Into Defensible Assurance
Supply chain risk cannot be eliminated, because dependency is how modern organisations operate. It can, however, be understood, prioritised and tested. The organisations that do this well know which suppliers matter most, hold evidence rather than assumptions about their exposure, and have rehearsed what they would do if a trusted connection turned against them.
If you want to understand and test the risk your suppliers and software introduce, our team of expert operators can help you scope the right assessment. Explore our penetration testing services, review our red teaming capability, or get in touch for a scoping conversation. You can also call StrikeCyber on 1300 654 898.
Frequently asked questions
What is supply chain risk in cyber security?
Supply chain risk in cyber security is the exposure an organisation inherits from the software, services and third parties it depends on. If a vendor, software component, managed service provider or cloud platform you rely on is compromised, that compromise can flow through to you. Because a single supplier can serve many customers, attackers see the supply chain as an efficient route to multiple victims. For Australian organisations, managing this risk means understanding not just your own environment but the access and dependencies your suppliers introduce.
What is an SBOM and why does it matter?
A software bill of materials, or SBOM, is an inventory of the components and dependencies that make up a piece of software, much like an ingredients list. It matters because modern applications are assembled from many open-source and third-party components, any of which could contain a vulnerability. When a widely used component is found to be flawed, an SBOM lets you quickly determine whether you are affected and where. Without one, organisations often cannot answer that basic question during a fast-moving incident.
How can attackers compromise a CI/CD pipeline?
Continuous integration and delivery pipelines automate how software is built and deployed, which makes them a high-value target. Attackers compromise pipelines through stolen developer credentials, exposed secrets and access tokens, malicious dependencies pulled in during the build, or weak access controls on the build systems themselves. A successful pipeline compromise can inject malicious code into legitimate software that is then distributed to customers, which is why securing and testing the build and deployment process is now a core part of supply chain assurance.
Why are managed service providers a supply chain risk?
Managed service providers often hold privileged, remote access to many client environments so they can deliver their services. That access is exactly what an attacker wants, because compromising one provider can open a path into every client it serves. If a provider's own security is weak, or its administrative access is not tightly controlled and monitored, it becomes a bridge into your environment. Managing this risk means scrutinising provider security, limiting and monitoring their access, and testing what a compromised provider connection could reach.
Does the SOCI Act affect supply chain security in Australia?
Yes. The Security of Critical Infrastructure Act requires responsible entities to manage material risks across several hazard domains, including supply chain hazards, as part of their Risk Management Program. This drives contractual flow-down, where critical infrastructure operators pass security expectations to their suppliers. Even organisations not directly covered by the Act increasingly face these requirements because they supply entities that are. Understanding where you sit in these chains helps you anticipate the obligations that will be passed to you.
How do we assess and test our third-party exposure?
Start by mapping your suppliers and the access and data each one has, then prioritise by the impact a compromise would cause. From there, combine due diligence and contractual controls with technical testing. Offensive security testing can assess the pathways a supplier compromise would open, probe externally facing components you inherit from vendors, and check how well you would detect misuse of trusted third-party access. This turns a vendor questionnaire into evidence about what an attacker could actually achieve through your supply chain.