Vendor Data Security Measures

🔐 13 cyber questions every CISO must ask vendors — before the breach The strongest security leaders aren’t the most paranoid in the room. They’re the most prepared. They don’t assume trust. They don’t rely on checklists. They don’t wait for an incident to discover gaps. They ask better questions  early. Here are 13 questions I believe every CISO should ask vendors (and why they matter): 1️⃣ What security attestations can you actually prove? → SOC 2 Type II, ISO 27001, CSA STAR → Industry compliance like HIPAA, PCI, HITRUST → Evidence builds confidence. Logos don’t. 2️⃣ How do you update controls — and notify us of changes? → Formal change-notification commitments → No silent downgrades without approval → Transparency protects both sides. 3️⃣ Who can alter our identity posture? → Least-privilege, role-based access → Step-up verification to stop social engineering → Identity is the new perimeter. 4️⃣ Can we see onboarding/offboarding workflows in action? → Execution logs, not just policies → Evidence from recent quarters → Process maturity shows up in practice. 5️⃣ What independent security testing do you run? → Regular pentests and vulnerability scans → More than once a year → Continuous testing beats annual reassurance. 6️⃣ List all OAuth integrations and privileged APIs → Token scope, rotation, expiration → Monitoring and instant revocation → Hidden access paths create hidden risk. 7️⃣ What happens if your process is abused — not your systems? → Contractual accountability for process failures → Clear evidence-sharing commitments → Many breaches start with people, not tools. 8️⃣ How do you monitor your staff in our environment? → Session recording and anomaly detection → Real-time alerts for privilege misuse → Trust still needs visibility. 9️⃣ How is our data isolated from other customers? → Identity and admin segregation → Blast-radius containment → Shared platforms need clear boundaries. 🔟 How fast will you notify us of an incident? → 24–72 hour guaranteed notification → Actionable forensic detail, not summaries → Speed matters when risk is active. 1️⃣1️⃣ How do you patch and remediate vulnerabilities? → SLAs for critical fixes → Proof patches are validated and persistent → Fixing fast isn’t enough — fixing right matters. 1️⃣2️⃣ Do you carry sufficient cyber insurance? → Coverage for multi-customer incidents → Protection beyond your own losses → Financial resilience is part of security. 1️⃣3️⃣ Can we test your processes ourselves? → Real-world scenario testing → Evidence beats questionnaires → Confidence comes from verification. Security maturity isn’t about asking more questions. It’s about asking the right ones. Because vendors don’t fail audits they fail expectations that were never clarified. 📌 Follow Marcel Velica for more practical cybersecurity leadership insights.

If you’re assessing AI cybersecurity risk in your vendors, here’s a short list of things you should be actively validating... Where the model lives Is the AI: - Hosted by the vendor? - Built on a third-party model (OpenAI, Anthropic, etc.)? - Running in your environment? If they can’t clearly articulate the architecture, that’s not innovation then it’s risk. What data touches the model Validate specifically: - What data is used for training? - What data is used for inference? - Is customer data ever retained, reused, or used to retrain? “Trust us” is not a data governance strategy. Model access & isolation You want to validate: - Tenant-level isolation - Role-based access to prompts, outputs, and logs - Controls preventing cross-customer data leakage If one customer’s prompt can influence another’s output… that’s a problem. Prompt & output security Assess whether they have controls for: - Prompt injection - Jailbreaking - Output manipulation - Abuse monitoring AI doesn’t remove the attack surface it creates a new one. Human-in-the-loop controls Where does a human: - Review outputs? - Approve automated actions? - Override decisions? Fully autonomous + no oversight = unacceptable risk in most regulated environments. Logging, monitoring, and forensics You should be able to validate: - Are prompts and outputs logged? Can they support incident investigations? - How do they detect misuse or anomalous behavior? If it can’t be audited, it can’t be trusted. Third-party risk inheritance AI vendors often are aggregators of other vendors. Validate: - Who are the underlying model providers? - What contractual and security assurances flow down? - How are upstream incidents communicated? - Your vendor’s AI stack becomes your risk stack. Bottom line: Assessing AI in vendors isn’t about whether they use AI. It’s about how it’s architected, governed, monitored, and controlled.

In 2022, Toyota had to shut down its entire manufacturing operations because of a cyberattack. It was a nightmare that resulted in $375 million loss. But here's an interesting catch – it wasn't an attack on Toyota!   Instead, it was against one of their plastic suppliers' company, Kojima. Because Kojima had third-party access to Toyota manufacturing plants, shutting down was necessary to protect their data. So, a cyber incident with one of its suppliers brought the giant car company to its heels.   Attackers are masters of finding creative ways. By compromising your vendors/suppliers, they can effectively compromise your organization, infiltrating it from within.   So how do attackers exploit vendors to compromise your company?   𝗛𝗲𝗿𝗲 𝗮𝗿𝗲 𝟰 𝗰𝗼𝗺𝗺𝗼𝗻 𝘃𝗲𝗻𝗱𝗼𝗿 𝘀𝗰𝗲𝗻𝗮𝗿𝗶𝗼𝘀 𝘁𝗵𝗮𝘁 𝗮𝘁𝘁𝗮𝗰𝗸𝗲𝗿𝘀 𝘂𝘀𝗲 𝗳𝗼𝗿 𝗲𝗻𝘁𝗿𝘆:   1) Attacker compromises your vendor staff identities > Uses them directly to access your data.   2) Attacker compromises a vendor device connected to your network > Gain an initial foothold inside your company.   3) Attacker finds a vulnerability in a 3rd party or vendor software > Compromises all systems in your corporate network running that software.   4) Attacker compromises a vendor SaaS app > Steals your company's data from 3rd party servers.   𝗛𝗼𝘄 𝗰𝗮𝗻 𝘀𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗮𝗻𝗮𝗹𝘆𝘀𝘁𝘀 𝗰𝗼𝘂𝗻𝘁𝗲𝗿 𝘁𝗵𝗲𝗺?   - Firstly, identify how do your vendors authenticate to your systems? Use a centralized identity system that handles the full life cycle of provisioning, tracking and de-provisioning. These accounts can typically live under your primary tenant and should be monitored just like your full-time employee accounts. Apply MFA & RBAC.   - Ensure that every vendor laptops/devices that are connecting to your network meet your company's device compliance standards. Treat vendor employee devices with the same level of security controls as your own company devices. These devices should have the same AV, EDR and other software that you mandate on your company devices.     - Maintain a detailed inventory of vendor apps running in your network along with their versions, systems where they are deployed etc. Having this information enables you to respond swiftly to zero-day vulnerabilities in those 3rd party apps.   - In the event of a security incident, establish right capabilities for your SOC teams to initiate containment actions. Ex: ability to disconnect a vendor's device from your network, reset a vendor account in your tenant, or block a vendor application.   - Conduct a thorough vendor security assessment in scenarios where you need to store sensitive data in vendor's servers. Evaluate their cybersecurity practices, protocols, and incident response capabilities. If you enjoyed this or learned something, follow me at Rohit Tamma for more in future! #vendormanagement #supplychainsecurity #cybersecurity #incidentresponse #identity #applicationsecurity #cyberattack

Top 15 Non-Negotiables in Third-Party Risk Management Working with vendors, suppliers, and partners is essential in today’s interconnected world. Below are 15 non-negotiable elements that every organization should prioritize in its third-party risk management program. 1. Clear Information Security Policies: Require all vendors to follow documented security guidelines that align with your company’s standards and industry regulations. 2. Robust Access Controls: Limit vendor access to the minimum necessary. Regularly review and revoke permissions when no longer needed, ensuring no lingering “back doors.” 3. Multi-Factor Authentication (MFA): Enforce MFA for all vendor accounts to prevent unauthorized access even if passwords are compromised. 4. Encryption of Sensitive Data: Insist on strong encryption measures for data both at rest and in transit to protect information from interception or theft. 5. Network Segmentation: Isolate third-party connections from critical systems. Segmented networks reduce the scope of potential damage if one segment is breached. 6. Regular Security Assessments: Conduct ongoing risk evaluations and audits of vendors’ security measures. Identifying weak spots early prevents larger issues later. 7. Incident Response Planning and Coordination: Have a clear, tested incident response plan that includes vendors. Everyone should know their role and how to communicate quickly in a crisis. 8. Timely Patch and Vulnerability Management: Require vendors to keep software up-to-date. Prompt patching of known vulnerabilities reduces the attack surface. 9. Vendor Training and Awareness: Expect your suppliers to educate their teams on security best practices, from spotting phishing attempts to following proper data handling procedures. 10. Regular Compliance Checks: Ensure that vendors meet relevant legal and regulatory requirements, maintaining a record of certifications, audits, and adherence to standards. 11. Secure Communication Channels: Use encrypted and authenticated methods for sharing information. Avoid unsecured channels that can expose sensitive data. 12. Business Continuity and Disaster Recovery (BC/DR) Plans: Confirm that vendors have robust BC/DR strategies. A strong plan ensures that operations can continue or recover quickly after a disruptive event. 13. Data Minimization and Retention Policies: Limit the amount of data vendors access or store. The less data exposed, the lower the risk if a breach occurs. 14. Periodic Contract Reviews and Updates: Review vendor contracts to ensure they reflect current security standards, responsibilities, and expectations. Update them as the threat landscape evolves. 15. Supply Chain Transparency: Demand visibility into vendor subcontractors and their security practices. Understanding the full supply chain helps identify hidden risks.

For most companies, third-party risk management means collecting SOC 2 reports, sending out security questionnaires, and checking a compliance box. But does any of that actually reduce risk? Not really. A vendor’s SOC 2 report won’t tell you if their misconfigured S3 bucket is exposing your data. Point-in-time reviews won’t catch real-world security failures. And if security is involved after the contract is signed, it’s already too late. 𝗥𝗲𝗮𝗹 𝘁𝗵𝗶𝗿𝗱-𝗽𝗮𝗿𝘁𝘆 𝗿𝗶𝘀𝗸 𝗺𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝗺𝗲𝗮𝗻𝘀: - 𝗖𝗼𝗻𝘁𝗶𝗻𝘂𝗼𝘂𝘀 𝗺𝗼𝗻𝗶𝘁𝗼𝗿𝗶𝗻𝗴. Vendor security postures change. A vendor that was secure last quarter might now be leaking sensitive data due to a configuration mistake. Static reviews don’t cut it. - 𝗥𝗶𝘀𝗸-𝗯𝗮𝘀𝗲𝗱 𝗽𝗿𝗶𝗼𝗿𝗶𝘁𝗶𝘇𝗮𝘁𝗶𝗼𝗻. Not all vendors pose the same risk. The focus should be on who has access to sensitive data, critical infrastructure, or business operations—not just treating every vendor the same. - 𝗩𝗲𝗿𝗶𝗳𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗯𝗲𝘆𝗼𝗻𝗱 𝗽𝗮𝗽𝗲𝗿𝘄𝗼𝗿𝗸. Security reviews should go beyond compliance reports and validate actual security practices. If a vendor handles PHI or financial data, they need more than just a checkbox audit. - 𝗔𝗻 𝗲𝘅𝗶𝘁 𝘀𝘁𝗿𝗮𝘁𝗲𝗴𝘆. If a critical vendor suffers a breach, goes offline, or loses compliance standing, how fast can you pivot? Business continuity planning needs to factor in vendor failures. Third-party risk isn’t just a compliance issue—it’s an operational one. 𝗜𝗳 𝘆𝗼𝘂𝗿 𝘃𝗲𝗻𝗱𝗼𝗿 𝘀𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗽𝗿𝗼𝗰𝗲𝘀𝘀 𝗶𝘀 𝗷𝘂𝘀𝘁 𝗰𝗼𝗹𝗹𝗲𝗰𝘁𝗶𝗻𝗴 𝗿𝗲𝗽𝗼𝗿𝘁𝘀, 𝘆𝗼𝘂’𝗿𝗲 𝗻𝗼𝘁 𝗺𝗮𝗻𝗮𝗴𝗶𝗻𝗴 𝗿𝗶𝘀𝗸—𝘆𝗼𝘂’𝗿𝗲 𝗷𝘂𝘀𝘁 𝗱𝗼𝗰𝘂𝗺𝗲𝗻𝘁𝗶𝗻𝗴 𝗶𝘁. #CyberSecurity #ThirdPartyRisk #CISO

I am currently modeling annualized loss expectancy for supply chain breaches to meet NIS 2 compliance requirements. This shift empowers chief information security officers to demonstrate the real return on investment for security spending. It transforms compliance from a necessary cost into a strategic protector of value. Because NIS 2 mandates proportionate measures, quantifying risk ensures capital flows to the most critical vulnerabilities. Relying on qualitative criteria and static scoring for vendor segmentation is a dangerous waste of time. These biased methods fail to capture dependencies and offer zero protection against negligence claims. In a regulatory audit, a subjective "high risk" label crumbles without data to back it up. We must move beyond indefensible guesswork to rigorous, quantifiable models that withstand legal scrutiny. Static questionnaires and qualitative heat-maps collapse under scrutiny: they miss hidden dependencies, ignore Nth-party concentration risk, and produce rankings that change dramatically depending on who fills them out. When the inevitable breach happens through an overlooked subcontractor, that spreadsheet becomes exhibit A in the negligence claim against you and the board. I prefer using unsupervised machine learning with K-Means clustering to segment vendors dynamically based on real-time risk data. This method automates the detection of outlier vendors that manual assessments miss. I often remind colleagues and students that risk extends far beyond direct suppliers. We utilize graph theory and centrality metrics to map Nth-party dependencies. This reveals systemic concentration risks deep in the supply chain. By detecting bridge nodes or subcontractors serving multiple critical vendors, you can preempt cascading failures that traditional audits ignore. Proficiency in network analysis is now a critical competency for compliance roles. We must also operationalize Software Bills of Materials beyond NIS2 compliance boxes. They are strategic tools for rapid vulnerability management and zero-day response. Integrating analysis into the procurement lifecycle allows organizations to shift security left and vet product integrity before contracts are signed. Experts who bridge legal procurement and technical vulnerability management will lead Security by Design initiatives in major technology firms. Finally, consider the personal liability NIS 2 places on top management. You need a robust governance framework that documents due diligence through regular reporting and signed accountability statements. This translates technical supply chain risks into business continuity impacts the Board understands and accepts. Switch to algorithmic clustering on annualized loss expectancy, dependency centrality, incident history, and SBOM entropy to develop a segmentation model that survives daylight. Anything else is theater. #RiskManagement #NIS2 #SupplyChainSecurity #QuantitativeRisk #CISO

Third-party risk isn’t just a compliance checkbox is where real breaches happen. Most third-party breaches come from vendors you thought were secure. A mature Third-Party Risk Management (TPRM) program helps you manage what you don’t control. Imagine your HR team wants to onboard a new employee wellness platform. Here’s what happens in a mature organization: 1. Intake & Risk Tiering Before any demo happens: - Does it process health data? - What tools will it connect to? Result? Risk tier assigned immediately — low, medium, or high. 2. Security & Risk Assessment They pass the initial screen. Now we go deeper: - Vendor security questionnaire - SOC 2 review - Fourth-party discovery (who they rely on) Result?3 major red flags in data retention uncovered. 3. Contract & Control Alignment Before the contract is signed: - Add encryption requirements - Include right-to-audit clause - Mandate quarterly security reviews Result? A secure contract — not just a fast one. 4. Ongoing Monitoring After onboarding, the work doesn’t stop: - Track their security scores continuously - Monitor breach alerts and dark web activity - Set up annual reassessments Result? Caught a major acquisition event before it introduced new risk. 5. Offboarding Done Right When switching providers: - Verify full data deletion - Audit system access closure - Document lessons learned Result? No shadow access, no loose ends. Why this even matters? - 62% of breaches start with a third party (Ponemon) - Most companies are indirectly connected to 10,000+ fourth-party vendors - Manual reviews miss over 80% of vendor risk changes The 2025 TPRM Standard To stay ahead, organizations must: - Automate vendor screening at the intake stage - Integrate risk reviews into procurement workflows - Monitor vendors continuously — not once a year - Extend oversight to fourth parties - Keep audit-ready documentation at every stage TPRM is about saying “yes, but with safeguards.” #ThirdPartyRisk #VendorRisk #TPRM #GRC #RiskManagement

Supply Chain Management → Third-Party Risk Management After my post about logistics translating to cybersecurity, someone asked: "How does supply chain experience help with security?" Simple: Every vendor is a security risk. In military supply chain, I had to: → Vet vendors before giving them contracts → Control their access to our facilities and systems → Monitor their performance and compliance → Ensure they followed our security protocols → Have backup vendors in case one failed In cybersecurity, I have to: → Vet vendors before giving them data access → Control their access to our networks and systems → Monitor their security posture and compliance → Ensure they meet our security standards → Have incident response plans if they're breached Same process. Same risk calculus. The 2023 MOVEit breach? Third-party vendor compromise. The Target breach? Third-party HVAC vendor. The SolarWinds attack? Third-party software supply chain. 70% of significant breaches involve third parties. Yet most cybersecurity programs treat vendor risk as an afterthought. My supply chain background taught me: → Your security is only as strong as your weakest vendor → Access control matters more than trust → Continuous monitoring beats one-time assessments → Always have contingency plans If you've managed vendors, negotiated contracts, or coordinated supply chains, you already understand third-party risk management. That's a $140K-$200K cybersecurity skill. Wednesday: How change management prevents security incidents.

Just like school group projects, one weak link can tank privacy compliance.   That vendor you trusted last year? They might be cutting corners today.   They may have launched new features, swapped sub-processors, or started using your data to train their AI.   And if you’re not paying attention, those changes could expose you to fines, data misuse, or public backlash.   Managing this risk is why various privacy regulations require companies to have contracts that spell out how vendors process personal information.   And regulators will hold you accountable if they don’t.   Regulators are asking companies what diligence did you do on a vendor?   They also might ask to see the vendor assessment performed (showing your homework is important here).   That's why regular, thorough, yet practical vendor assessments are essential.   They are also not a one-and-done exercise because key changes in the vendor or the business use cases can be missed.   When done properly and regularly, a vendor assessment will: ✔ Be rightsized to the type of data being shared and the risk to the business. ✔ Identify gaps in a vendor’s ability to meet legal obligations ✔ Evaluate technical and organizational safeguards ✔ Confirm whether vendors support privacy rights (e.g., deletion, access) ✔ Flag vendors with histories of noncompliance or security incidents ✔ Ensure you have a DPA in place with clear responsibilities and breach notification terms The assessment should also cover how the vendor is using your business data. Such as is your data also being used for the vendor's purposes?   AI takes risk to a new level. In fact, a great way to get attention to do vendor assessments is piggybacking on AI projects (everyone seems to care about AI these days!)   Fun reminder: AI risk can pop up in existing vendors who roll out new features.   It's why vendor assessments are not optional.   Reviewing new and existing vendors is how you protect your data, meet legal requirements, and avoid costly surprises.   Read our recent blog to learn how to build effective vendor assessments (link in comments)   ♻ Share our carousel to help other companies strengthen their vendor assessment programs. 👇