Your Guide to Third-Party Cyber Risk Management (TPRM) in Supply Chains

Modern businesses run on third parties. Payment processors, cloud providers, software vendors, outsourcing partners. They make it possible to move faster, scale efficiently, and access expertise you could never build internally.

But every external partner also expands your risk surface.

Security weaknesses, operational failures, or compliance gaps in a vendor can ripple directly into your organization. The convenience of outsourcing often comes with risks that are harder to see and even harder to control.


The question isn’t whether to rely on third parties. Most companies have no choice. The real question is how well you understand and manage the risk that comes with them.


Fortunately, third-party cyber risk management (TPRM) helps to mitigate these issues, providing your organization with a full understanding of your third-party business relationships and the safeguards that these vendors employ.

Here, we will explore TPRM in more depth, along with its key components, best practices for implementing the framework, and potential challenges you may come across.

What is third-party cyber risk management?

TPRM is a structured approach, or framework, used to find and eventually alleviate the risks introduced by using external vendors, partners, and service providers. It focuses on the following 4 goals:

Importantly, this framework is used before any vendor risk management technologies are put in place. This makes it a proactive step which ensures any tools added later actually support a well-organized and effective risk management program, instead of being applied randomly.

What is the difference between TPRM and general risk management?

The crucial thing to remember is that TPRM focuses specifically on cybersecurity risks that originate outside your direct control, unlike other, more general risk management frameworks like Enterprise Cyber Risk Management, which manages all cyber risks, whether internal or external.

Instead of asking “Is our system secure?”, TPRM asks “What happens to our business if our vendor fails?” and “Is this level of dependency risk acceptable?”

For a broader framework that covers both internal and external risk including governance structures, audit readiness, and regulatory compliance see our governance, risk, and compliance services.

The importance of TPRM

Modern organizations are deeply interconnected. Applications rely on third-party libraries, infrastructure runs on cloud platforms, and vendors often process sensitive data or support critical operations.


In fact, 60% of organizations report working with more than 1,000 third‑party vendors across areas such as supply chain, IT, and other functions.


The reality is that the more interconnected your work environment is, the bigger your attack surface becomes. A security gap, operational failure, or compliance issue in a vendor can quickly cascade into your own environment. As vendor ecosystems grow more complex, structured third-party risk management becomes essential to maintain visibility, accountability, and control. 


This growing complexity makes structured TPRM essential to maintain visibility and control across your entire vendor ecosystem.


Regulatory compliance is also a key reason why TPRM is so important. You must ensure that any third-party vendors you work with meet all applicable cybersecurity and data protection requirements to avoid penalties and reputational damage. 


The Digital Operational Resilience Act (DORA) in the European Union, for example, requires financial institutions to monitor, document, and control their relationships with vendors as part of their overall operational resilience framework. DORA only applies to the financial sector, but it represents a wider trend across regulations such as the NIS2 Directive and the General Data Protection Regulation, which all emphasize that managing third-party risk is a crucial part of cybersecurity and compliance.

Structured TPRM helps achieve this with oversight of vendor obligations and evidence of due diligence.

Benefits of implementing third-party risk management

Of course, third-party cyber risk management helps reduce the likelihood of attackers exploiting weaknesses in your vendors, because you find and mitigate risks before they have a chance. This proactive approach has a number of other advantages, however, such as:

But how can you keep track of these risks across so many different external systems? TPRM gives structured oversight to ensure visibility and allow for proactive mitigation. 

Key components of the third-party risk management framework

The lifecycle of a mature TPRM framework is very similar to that of general enterprise cyber risk management, with the process being continuous rather than a one-time assessment. The only difference is that it is focused purely on external parties. The program follows the following steps:

STEP 1

Identification

First, identify your most important third-party vendors and dependencies. Then, ensure you know what assets they can access, where they store your data, and how your systems are connected.

STEP 2

Third-party risk assessment

The next stage is to assess any potential risks based on three factors:


By assessing risk in this way, you translate technical exposure into business-relevant risk statements, which help you rank vendors by risk severity.

STEP 3

Due diligence

Once you’ve understood and prioritized vendor risk, you should then review each vendor: 


STEP 4

Mitigation

You’ve conducted a thorough analysis of your vendors, so you know where risks lie and which are most important. Now, it’s time to start reducing them. This can be done via a variety of methods, including:


STEP 5

Contracting

Ensure your contracts with any vendors clearly define their obligations and accountability, going beyond pricing and deliverables to include information security and compliance. This includes adding security clauses, SLAs, incident notification timelines, and audit rights.

STEP 6

Ongoing monitoring

A third-party risk management strategy only works consistently if you run through this checklist on a rolling basis. You should continuously monitor vendor posture, any new vulnerabilities (CVEs), and security advisories. This allows you to reassess your position with vendors periodically and determine whether you need to implement any new mitigations.

STEP 7

Offboarding

Should you decide to end your relationship with a third party as a mitigation, it’s essential to ensure that all access and data are properly handled to prevent lingering risks. This includes secure termination of access (removing all access and permissions) and data return or deletion. 


Additionally, you should keep records of the offboarding process and any communications, as well as documenting any lessons learned for future vendor risk management.

What are the best practices in a vendor risk management program?

Following the steps above will put you on the right track to effectively implement a third-party cyber risk management program. There are certain best practices you should also keep in mind, however, to ensure success.

Develop a thorough plan

To be most beneficial business-wide, your TPRM should align closely with your broader enterprise risk management. This will ensure vendor risks are evaluated in the same context as other exposures, and that decisions support overall business objectives. As part of this, define your risk appetite, assign set roles, establish escalation paths, and define how vendors are approved or rejected based on risk evaluations.


This guarantees that your TPRM program is executed consistently and remains proactive.

Prioritize vendors by risk

Vendors are not equal, and they should not be treated as such. After you’ve assessed each third party by threat, likelihood, and impact, you should use this insight to rank them by overall risk level. This allows you to focus resources on the most critical relationships first.

Establish communication channels

Exposures are more likely to go unnoticed and unaddressed if you and your vendors work in silos. Instead, you should try to maintain defined points of contact for highlighting security incidents and escalation.

Create incident response plans

Although a third-party risk management program is designed to proactively address risks before they escalate, some issues are unavoidable. But this doesn’t mean you cannot be prepared to address them. Rehearse a variety of supply chain incident scenarios and ensure your teams are familiar with the relevant detection, containment, communication, and recovery procedures.

Promote a security-first culture

Although technology and practices go a long way in improving risk management, they are not enough on their own. To be truly effective, TPRM depends on embedding security awareness deep into your organization’s culture. This is the best way to ensure that all employees understand their role in managing third-party risk and consistently apply best practices in their daily work.

You can help foster a security-first mindset by training teams to recognize social engineering risks, enforcing MFA on repositories, embedding security in procurement and development workflows, and encouraging reporting and accountability.

Challenges in implementing a third-party risk management framework and how to overcome them

It may sound easy in theory to manage third-party cyber risks: evaluate vendors, rank risks, and reduce exposure. But in practice, it can present some hurdles, largely due to the process being continuous and highly dependent on your people and processes, which can present challenges in dynamic multi-vendor environments.


Here are some of the most common obstacles to address:


Threat and risk assessment

You have picked out your most important assets. Now you need to determine the threats that could put them at risk. This may include obvious cybercrimes, like ransomware and phishing, as well as insider threats, third-party failures, software vulnerabilities, and physical or environmental risks. Again, which poses the highest threat depends on your business context, so don’t just use generic threat lists.


This is the stage at which likelihood and impact are used to determine risk severity. As noted earlier, a highly likely but low-impact event may be less critical than a rare but catastrophic one. It is up to you to ascertain how much risk you are willing to accept.

By converting technical threats into business-relevant risk statements, decision-makers have more chance of understanding the potential consequences to business objectives and making informed choices about prioritization and treatment.

Lack of visibility across third- and fourth-party relationships

Much of your software and applications are not built in-house. Rather, 80 % to 90 % of the code in a typical enterprise application consists of third‑party (often open‑source) components. It’s these dependencies that can create risk when not fully monitored and managed. 


What’s more, fourth-party dependencies, like subcontractors, may introduce exposure you never directly approved.


How can you account for this in your TPRM implementation? Creating an in-depth and up-to-date map of your third-party ecosystem is crucial here. Maintain a continuously updated vendor and dependency inventory and secure software bill of materials (SBOMs) where applicable. Furthermore, demand transparency into critical subcontractors and periodically reassess vendors to capture posture changes.

Over-reliance on questionnaires and compliance checklists

Treating TPRM as a checkbox exercise is one of the biggest mistakes made by supply chains. It is not enough to distribute security questionnaires, collect certifications like ISO 27001 or SOC 2, and consider the job done.


This may make you feel secure, but it is not effective because compliance does not automatically equate to resilience. 


Instead, you should convert questionnaire results into a business impact analysis and combine documentation review with technical validation where possible. Most crucially, remember to avoid generic threat lists and assess risks within your specific context. This ensures you’re evaluating risk based on likelihood and impact, not just paperwork.

Human risk and social engineering

While technology can offer security to a certain extent, your teams’ awareness and actions remain crucial to cybersecurity. Human risk, such as phishing or social engineering, is the most exploitable entry point for attackers. 


To prevent your personnel from falling victim to a convincing email, education and culture are key.


Conduct simulated phishing exercises to identify where training may be required, and implement security controls like MFA across systems for when human error does occur to help prevent a data breach. Foster a culture in which reporting issues is expected and share responsibility across various departments.

Weak governance and undefined ownership

TPRM often fails because responsibility is unclear. After all, cyber resilience spans multiple teams, and so it’s easy to assume the responsibility lies with someone else. Product teams may rely on Security, while Security is under the impression that IT embeds protections, and IT is waiting on Leadership. This is how security gaps are created. 


To avoid this, it’s essential to assign clear risk ownership and to embed TPRM within your wider enterprise risk management. This helps establish consistent governance and accountability. Additionally, communicating risk in business terms will help your people understand what’s needed from whom.

Incident response gaps

Your TPRM can be as thorough as possible, and yet unexpected attacks may still break through your defenses. As a result, preparing for third-party failure scenarios is as important as working to prevent them. Just as TPRM is proactive, you should determine how to react in the event of a breach before it actually occurs. 


Develop and rehearse third-party incident response plans, including defining notification timelines contractually, establishing internal escalation workflows, and maintaining backup and disaster recovery procedures.


This helps to prevent chaos and, most importantly, limits the impact of an attack.

Infinum supports your third-party security

Infinum has recently acquired cybersecurity company AMR Cybersecurity, meaning we can help organizations identify and understand vulnerabilities that might arise from third‑party integrations or software dependencies.

Our services include everything from security assessments and red teaming to secure‑by‑design guidance and governance support, all of which help you go beyond one‑off checks and build the ongoing risk controls and oversight needed for effective TPRM. 


What’s more, with leading expertise in recognised security standards and compliance frameworks, such as NIS2 and PCI DSS, partnering with us allows you to better align vendor security expectations with regulatory requirements and demonstrate due diligence.


Instead of treating cybersecurity as an afterthought, Infinum’s approach, backed by AMR’s deep security experience, embeds risk considerations into your software and infrastructure development, helping you manage third‑party risk as part of your overall technology strategy.