Third-Party Risk Assurance: Applications, Vendors & Suppliers
Understand the cyber risks introduced by the applications, vendors and suppliers your business relies on.
Third-party technology and services are central to modern organisations, but every new application, external provider and business-critical supplier can introduce security, data protection and operational risks. Understanding those risks before approval, and managing them throughout the relationship, is essential to making informed decisions.
Samurai Security's Third-Party Risk Assurance service helps organisations evaluate new applications, assess vendor and supplier security, and establish a consistent approach to third-party risk management. We combine practical cybersecurity expertise with structured assessment criteria, evidence review and clear recommendations to support proportionate, defensible risk decisions.
Our service covers two complementary requirements:
- Third-Party Application Risk Assessments: Focused security reviews of new applications and software services, designed to support timely approval decisions and reduce the workload on internal security teams.
- Supplier Risk Assurance: A more comprehensive approach to identifying, assessing and managing risks across vendors, service providers and the wider supply chain, including higher-risk suppliers and ongoing assurance.
Whether you need support reviewing individual software requests or developing a repeatable supplier assurance programme, we tailor the assessment depth to the nature of the service, the information it handles and its importance to your organisation.
What Is Third-Party Risk Assurance?
Third-party risk assurance is the process of understanding the risks an organisation inherits when it relies on external applications, vendors and suppliers. It considers the security measures operated by those third parties, the access and data they require, their importance to business operations and the evidence available to support their security claims.
The objective is not simply to collect questionnaires or assign a pass or fail score. It is to give decision-makers a meaningful picture of potential exposure, the controls that may reduce it and the actions needed before a third party is approved or continues to be used.
Third-Party Application Risk Assessments
Practical security reviews to support application approval decisions.
When an employee requests a new application, cloud service or software tool, your security team needs to understand the risks before the business starts using it. Our application risk assessments provide a consistent, proportionate review of the proposed product and its vendor, including the information the application will access and the security information that can be verified.
Each application is assessed against agreed criteria and assigned a documented risk profile with clear recommendations. The outcome supports your internal approval, conditional approval or rejection process, while the final decision remains with your organisation.
Supplier Risk Assurance
Structured, risk-led assurance throughout the supplier lifecycle.
Supplier Risk Assurance goes beyond individual application requests. It helps organisations understand their supplier landscape, identify business-critical relationships, review the security of suppliers and maintain oversight as risks, contracts, services and threats change.
Our approach considers supplier criticality, available evidence, security control gaps, remediation requirements and relevant contractual or business safeguards. Higher-risk relationships can be subject to additional evidence validation and separately scoped technical assurance where appropriate.
The aim is to establish a repeatable supplier risk management process that produces actionable outcomes rather than relying on one-off questionnaires or unqualified platform scores.
Why Is Third-Party Risk Assurance Important?
Organisations increasingly depend on external software, cloud services, outsourced operations and interconnected suppliers. These relationships can create exposure outside the direct control of the internal IT and security team.
An application may request more access than it needs, a supplier may process sensitive information without providing sufficient assurance over its controls, or a critical service provider may depend on another organisation whose disruption affects your operations. Risks can also change after the original approval through new vulnerabilities, incidents, changes to permissions or changes in the supplier's own operations.
Third-party risk assurance helps answer important questions:
- Do we know which applications and suppliers have access to our information, systems or business processes?
- Have proposed applications been reviewed before employees start using them?
- What permissions, integrations and sensitive data does a new application require?
- Which suppliers are essential to our operations and should receive more detailed assurance?
- Are suppliers' security statements supported by suitable evidence, or based solely on self-declaration?
- What risks remain after current controls and contractual safeguards are considered?
- Who is responsible for remediation, exceptions and the final decision to accept a risk?
- Can we identify and respond when an important supplier's security position changes?
A consistent assessment and assurance process helps the business make proportionate decisions, reduces unmanaged third-party exposure and creates a clearer record of how supplier risks are being addressed.
Key Benefits of Our Risk Assurance Services
Faster, More Consistent Application Decisions
Apply agreed criteria to new software and cloud service requests so that security reviews are repeatable, documented and easier for business teams to act upon.
Reduced Pressure on Internal Security Teams
Use external cybersecurity expertise to support application due diligence, supplier assessment reviews and remediation follow-up, allowing internal teams to focus on other priorities and retain oversight of final decisions.
Better Visibility of Third-Party Exposure
Understand which applications and suppliers interact with your systems, handle sensitive information or support important business processes, and where assurance coverage is incomplete.
Assurance That Reflects Business Risk
Direct more detailed scrutiny towards relationships with higher business impact, greater data exposure, privileged access or operational dependence rather than applying the same review to every supplier.
Evidence-Based Recommendations
Identify weak, missing or contradictory security information, distinguish confirmed findings from unanswered questions and document the rationale behind recommended actions.
Ongoing Risk Management
For customers using the wider supplier assurance service, monitor material supplier changes and emerging concerns, track remediation activity and revisit risk decisions when circumstances change.
Support for Governance and Audit Requirements
Maintain assessment records, approval recommendations, evidence requests, exceptions and remediation actions to support internal governance and relevant audit or regulatory requirements.
What Does Our Third-Party Risk Assurance Service Cover?
The service can be commissioned for individual applications, defined groups of suppliers or a wider supplier assurance programme. The activities below are tailored to the agreed scope and the information available.
Area 1: Third-Party Application Risk Assessments
Application Intake and Business Context
For each application request, we first establish what is being considered and how it will be used. The information provided typically includes:
- Application name and website or product URL
- Intended business purpose and requesting team
- Types of information the application may access, store or process
- Proposed permissions, integrations and connections to existing systems
- Any other details relevant to how the application will be deployed or used
This context allows the assessment to consider how the application would be used within your organisation rather than relying solely on generic information about the vendor.
Vendor Verification and Trustworthiness
Review available information about the provider behind the application, including its identity, published security information and other relevant indications of supplier legitimacy or credibility.
Application Vulnerability and Breach History
Examine publicly available vulnerability disclosures, security incidents and relevant breach history to identify known concerns that may affect the proposed application or service. The absence of publicly reported issues is not treated as proof that an application is secure.
Permissions and Data Access Analysis
Consider what permissions the application requests, the information it may access and the implications of connecting it to internal systems. Particular attention is given to requests for sensitive information, extensive account privileges or broad integrations where these are relevant to the intended use.
Public Policies and Compliance Information
Review available privacy, security and compliance statements, published policies and supporting documents, noting where key information is absent or insufficient to support a conclusion. A published certification or policy does not by itself establish that every relevant control operates effectively.
Security Measures Assessment
Assess the information available about relevant security controls, such as authentication, access management, protection of information and other safeguards appropriate to the application and its business purpose.
Risk Rating and Recommendation
The assessment evaluates each agreed area and provides an overall risk profile. Depending on the agreed methodology, results may be expressed as Low, Medium or High risk, supported by an explanation of the material findings, unanswered questions and suggested treatment.
The report is designed to help your Information Security Team decide whether the application should be approved, approved with conditions, escalated for further review or not approved. Samurai provides an independent assessment and recommendation; the customer retains responsibility for its approval decision.
Assessment boundary: This is a focused application due diligence review using supplied and available evidence. It does not automatically include access to a vendor's internal systems, independent confirmation of every security claim or penetration testing of the application.
Area 2: Supplier Risk Assurance
1. Supplier Risk Methodology and Programme Setup
Establish an assessment approach that reflects your organisation's policies, risk appetite and operating environment. Activities can include:
- Working with security, procurement, legal, IT and business owners to understand current supplier governance
- Establishing appropriate supplier assessment and evidence requirements
- Defining how supplier criticality, identified control gaps and residual risk will be assessed
- Setting risk treatment, exception, escalation and approval thresholds
- Aligning the process with relevant internal policies and external obligations
- Configuring agreed supplier risk management tools and assessment rules, where included in scope
The outcome is a consistent approach for deciding what assurance is necessary and who is accountable for each decision.
2. Supplier Discovery, Inventory and Risk Tiering
Develop a clearer view of your supplier landscape and identify relationships that merit priority attention. Activities can include:
- Consolidating supplier records with business and contract owners
- Recording the services provided, data handled, access levels and important dependencies
- Classifying suppliers into agreed High, Medium or Low criticality tiers
- Prioritising assurance for suppliers supporting essential business activities or handling higher-risk information
- Identifying gaps in supplier onboarding or assessment coverage
- Considering material fourth-party and wider supply chain dependencies where suitable information is available
Criticality is used to determine the appropriate depth and frequency of assessment. It is not the same as a supplier's overall security risk rating.
3. Supplier Security Assessment and Risk Decisions
Evaluate supplier assessment responses against your organisation's requirements, rather than relying on a single questionnaire score. Activities can include:
- Reviewing supplier profiles, responses and available supporting information
- Identifying missing, weak, ambiguous or contradictory statements
- Considering business impact, compensating controls and contractual safeguards
- Requesting clarification or additional evidence where appropriate
- Developing proportionate remediation recommendations with owners and target dates
- Recommending approval, conditional approval, escalation or rejection where relevant
- Documenting decision rationale, exceptions and outstanding risk
This creates a defensible record of what was reviewed, what remains uncertain and why a particular course of action was recommended.
4. Evidence Validation and Critical Supplier Assurance
Some suppliers require assurance beyond self-assessment. For business-critical or higher-exposure relationships, additional activities may include:
- Reviewing relevant certifications, audit summaries, policies and security testing summaries
- Evaluating incident response and business continuity information
- Challenging unclear or unsupported assertions through follow-up questions or meetings
- Considering whether further assurance is justified by the business impact or remaining uncertainty
- Recording the level of confidence supported by the evidence and any material limitations
Where necessary, a separately agreed engagement may include a more detailed control review, supplier audit, technical assessment or penetration test. These activities require an appropriate scope and authorisation and are not implied by a standard supplier questionnaire review.
5. Ongoing Supplier Risk Monitoring and Threat Response
For organisations requiring continuing assurance, the service can extend beyond initial assessment and onboarding. Agreed activities may include:
- Reviewing significant supplier profile changes and relevant risk notifications
- Assessing whether emerging vulnerabilities, incidents or threats affect suppliers you rely on
- Prioritising follow-up based on the supplier's criticality and the potential business impact
- Contacting suppliers, where authorised, to request exposure and remediation information
- Coordinating escalation with internal security, business continuity or incident response teams
- Tracking agreed actions and updating risk records as exposure changes
Monitoring operates to the scope, coverage, reporting frequency and response arrangements agreed for the engagement. It should not be interpreted as unrestricted or continuous 24-hour monitoring unless expressly contracted.
6. Policies, Procedures and Audit Readiness
Help embed third-party assurance into normal business operations by reviewing or developing supporting governance processes. This may include:
- Supplier security and third-party risk management policy requirements
- Application and supplier onboarding procedures
- Periodic reassessment and event-driven review triggers
- Evidence requests, findings management and remediation tracking
- Exceptions, escalation and formal risk acceptance
- Supplier offboarding and records retention arrangements
- Governance responsibilities and management reporting
- Records demonstrating how decisions were made and followed up
The objective is a sustainable and auditable process, not simply a completed questionnaire or a point-in-time assessment.
Technology-Enabled Assurance
Supplier risk management platforms can help organise supplier information, assessment responses, monitoring and records. Samurai's role is to interpret the information, assess material risks, challenge important claims and coordinate the agreed next steps. Platform results are treated as inputs to risk decisions, not substitutes for professional assessment or customer approval.
Who Is This Service For?
Our Risk Assurance services are relevant to organisations that use external applications or depend on vendors and suppliers to deliver business-critical services. This can include:
- Information Security Teams managing application approval backlogs
- IT and procurement teams reviewing new software, cloud services or technology suppliers
- Businesses seeking a structured third-party risk assessment and onboarding process
- Organisations with extensive supplier estates or complex outsourcing arrangements
- Companies relying on suppliers with access to confidential, personal or business-critical information
- Organisations that need stronger ongoing supplier oversight and risk reporting
- Security and governance teams preparing evidence for internal audit or relevant standards
- Businesses looking to supplement internal supplier assurance capacity with specialist support
The application assessment service is suited to repeatable software approval reviews. The wider supplier assurance service is intended for organisations that need greater oversight across supplier relationships and their lifecycle.
Why Choose Samurai Security?
Practical Cybersecurity Assessment Expertise
Our approach is informed by the security implications of third-party applications, access permissions, external services and supplier controls. We focus on identifying meaningful risks and the evidence necessary to support a decision.
01
A Proportionate, Risk-Led Approach
Not every application or supplier requires the same level of review. We align assessment depth to business purpose, information sensitivity, supplier criticality and the agreed risk appetite.
02
More Than a Questionnaire Score
We assess the substance of supplier responses, identify evidence gaps and explain their implications. Where relevant, we recommend further validation rather than treating unverified declarations as established facts.
03
Clear Recommendations and Accountability
We produce structured findings and practical actions, with traceable rationale. Your organisation remains in control of its supplier relationships, approval decisions and formal acceptance of residual risk.
04
Flexible Support for Internal Teams
Engagements can be designed around individual application reviews, an initial supplier assurance project or a defined ongoing managed service, depending on what the organisation needs.
05
Our Approach to Risk Assurance
Application Risk Assessment Process
01
Submit the Application Request
Your team supplies the application name, URL, intended business use and any available information about requested data access or integrations.
02
Establish the Assessment Context
We review the available information and apply the agreed criteria to the way the application is intended to be used.
03
Conduct the Security Review
We evaluate vendor information, known vulnerabilities and incidents, permissions, published policies and available evidence of security measures.
04
Evaluate Risk and Recommend Action
We document findings, assign the agreed risk levels and recommend suitable treatment or any follow-up questions.
05
Report for Internal Approval
Your security or designated business decision-maker receives the assessment and determines whether the request should proceed, subject to any required conditions or further review.
Supplier Risk Assurance Process
01
Understand Your Business and Supplier Estate
We work with relevant teams to understand supplier dependencies, business impact, policies and existing risk processes.
02
Establish the Methodology and Priority Suppliers
We define assessment criteria, criticality tiers, approval thresholds and the supplier relationships to review first.
03
Assess Security Controls and Available Evidence
We review supplier responses, identify control gaps and challenge material claims where further evidence is justified.
04
Recommend Decisions and Remediation
We provide risk findings, suggested treatment, exceptions and actions for your organisation and relevant suppliers to consider.
05
Support Ongoing Assurance Where Agreed
For managed engagements, we follow up on remediation, reassess material changes and help maintain risk information and management reporting.
06
Strengthen Governance and Audit Records
We help establish repeatable procedures and a traceable record of assessments, decisions, ownership and follow-up actions.
What Will You Receive?
Application Risk Assessment Deliverables
For each application assessed, deliverables can include:
- A structured application risk assessment, typically in spreadsheet form
- Findings against the agreed review categories
- Individual criterion risk ratings and an overall application risk profile
- A description of the material concerns and gaps in available evidence
- Practical recommendations for approval conditions, mitigation or further investigation
- A record that can be retained in the organisation's application approval workflow
Where a recurring review arrangement is agreed, the service may also include batch submission procedures, assessment tracking and reporting against defined service levels.
Supplier Risk Assurance Deliverables
Depending on the agreed modules and service scope, outputs can include:
- Supplier inventory, ownership information and criticality tier register
- Supplier risk assessment methodology and control expectations
- Initial supplier risk overview, heatmap and prioritised review plan
- Assessment findings and recommendations for individual suppliers
- Evidence review records and clarification requests
- Remediation tracker, actions and owners
- Supplier risk decision, exception and approval records
- Reports on outstanding risks, assessment coverage and supplier changes
- Governance documentation, procedures and reporting packs
- Critical supplier assurance reports where deeper reviews are commissioned
Management Information and Ongoing Reporting
For an agreed managed service, reporting may track supplier coverage, high-risk findings, overdue remediation, outstanding approvals, exceptions requiring review, significant supplier changes and the status of relevant threat-related actions.
Reporting principle: Findings should distinguish observed evidence, supplier assertions, identified gaps and matters that remain unverified. The purpose is to help the customer make informed decisions rather than imply a level of assurance that the available evidence cannot support.
Supporting Security Governance and Compliance
Third-party risk assurance can support organisations in demonstrating that external application and supplier risks are identified, reviewed, treated and monitored in a controlled and consistent manner.
Depending on the organisation and the services being assessed, the work can support risk-management activities relevant to:
- ISO/IEC 27001: Supplier relationships, relevant security requirements, monitoring of supplier services and related information security controls
- NCSC Cyber Assessment Framework (CAF): Supply chain risk management and relevant governance expectations
- UK GDPR and data protection obligations: Appropriate consideration of third parties that process personal data, including the information needed to support supplier due diligence where relevant
- Internal procurement, information security and supplier management policies: Consistent application of required assessment and approval procedures
- Sector-specific requirements: Additional supplier assurance expectations where they apply to the organisation
The exact controls and obligations considered are determined during scoping. An assessment, supplier questionnaire or platform score does not by itself establish regulatory compliance or independently verify every supplier control.
Our Work
Strengthening Cybersecurity Resilience
“Samurai takes the time to understand our needs and helps us to be an enabler for Flagship Group’s mission. It’s always a pleasure to work with them and I’d recommend them to others.”
Enabling Remote Work for the NHS
“When I have a problem nobody else can solve, I call Samurai because I know that they’ll deliver what I need, every time, without fail.”
Incident Response Retainers To Enable Growth
“This partnership has allowed us to scale and grow with the confidence that we are protected from cyber threats around the clock.”
Client Testimonials
“Samurai takes the time to understand our needs and helps us to be an enabler for Flagship Group’s mission. It’s always a pleasure to work with them and I’d recommend them to others.”
“We were astonished by what Samurai’s Black Dragon assessment revealed, even though we thought we had everything covered. The findings spoke for themselves, and the team’s expertise and clarity were outstanding.”
"Samurai’s Black Dragon: Attack Surface Risk Assessment was exactly what we needed and something we’ve never seen done before. They turned it around quickly, highlighted risks that could have easily been overlooked, and gave us a clear roadmap for improvement."
Frequently Asked Questions
What is a third-party risk assessment?
A third-party risk assessment evaluates the potential security and business risks associated with using an external application, vendor or supplier. It considers factors such as the service provided, access to systems and information, available evidence of security controls and the impact if the third party is compromised or disrupted.
What is the difference between an application risk assessment and supplier risk assurance?
An application risk assessment is typically a focused review of a proposed product or software service to support an approval decision. Supplier risk assurance is broader: it considers the supplier relationship, business criticality, supporting evidence, security weaknesses, remediation and the need for future reassessment or ongoing oversight.
Can you review new software or SaaS applications before we approve them?
Yes. Our Third-Party Application Risk Assessment service is designed to help security and IT teams review proposed applications before approval. We evaluate the available information against agreed criteria and provide a documented risk profile and recommendations for the internal decision-maker.
What information do you need to assess a new application?
Typically, we need the application name, product URL, intended business purpose and available details of the information or systems it needs to access. Additional technical or procurement context can help us assess the specific risk to your organisation more accurately.
Do you decide whether an application or supplier should be approved?
We provide assessment findings and recommendations, including conditions or remediation actions where relevant. Your organisation retains responsibility for the final approval, rejection or formal acceptance of residual risk, in line with its own governance and approval arrangements.
Is a supplier questionnaire sufficient to prove a supplier is secure?
No. Supplier responses are useful inputs to an assessment, but some claims may require supporting evidence or clarification. The depth of review should reflect the supplier's importance and the risks involved. For higher-risk suppliers, additional validation may be appropriate.
Do all suppliers require the same depth of assessment?
No. A proportionate approach considers business impact, the information a supplier handles, its access privileges, service dependencies and the consequences of disruption. A critical supplier may require deeper evidence review and more frequent reassessment than a lower-impact provider.
Can you help us manage supplier risk after onboarding?
Yes, where an ongoing assurance service is agreed. Activities may include reassessments, review of significant changes or relevant alerts, remediation follow-up and management reporting. The coverage and response arrangements are defined in the engagement scope.
Do you use Risk Ledger for supplier assurance?
A Risk Ledger-enabled approach can be considered where the platform is selected and appropriately licensed for the engagement. The platform can support supplier information and monitoring workflows, while Samurai provides risk methodology, assessment, challenge and recommendations. The exact capabilities and responsibilities must be confirmed during scoping.
Does supplier risk assurance include technical testing or a supplier audit?
Not automatically. The standard assessment approach reviews available supplier information and supporting evidence. More detailed audits, control walkthroughs or penetration testing may be recommended for selected higher-risk suppliers, but they require separate scope, permissions and agreement.
Related Samurai Security Services
Virtual CISO (vCISO)
Strategic cybersecurity oversight to help organisations manage risk, define security priorities and integrate third-party assurance into wider security governance.
Compliance Policy Review
Review and improve information security policies and procedures, including supporting governance for risk assessment, approvals and ongoing management.
ISO 27001 Certification Support
Support for organisations developing an information security management system and aligning relevant supplier and third-party controls with ISO 27001 requirements.
Penetration Testing
Where a specific application, platform or supplier environment warrants technical validation, a separately authorised penetration test can assess the security of the agreed systems.
Make Better-Informed Decisions About Third-Party Risk
Whether you need timely security reviews for new applications or a structured approach to vendor and supplier assurance, Samurai Security can help you understand the risks, identify where further evidence is needed and prioritise practical action.
Speak to our team about an application risk assessment, supplier assurance review or an ongoing third-party risk management engagement.
Get in touch
Let's find a solution
If you want to chat, give us a call: 0121 740 1304
Or, email us: info@samuraisecurity.co.uk