In today’s dealmaking environment, cybersecurity risks can determine whether a transaction creates value or collapses under hidden liabilities. High-profile cases illustrate the stakes: when “Yahoo disclosed two major data breaches during its acquisition by Verizon, the purchase price dropped by $350 million, roughly 7% of the deal’s value” [1]. Similarly, “Marriott faced $23.98 million in regulatory fines and extensive reputational damage after it acquired Starwood Hotels, only to discover that attackers had already compromised millions of guest records prior to closing” [2].
These examples highlight a hard truth: buying another company means inheriting its digital risks. According to PwC, “80% of global dealmakers reported uncovering cybersecurity issues in at least one-fourth of their M&A targets in the past two years” [3].
Cybersecurity due diligence prevents these surprises. It evaluates security posture before a merger, acquisition, partnership, or vendor engagement. Done right, it reduces risk, strengthens negotiating positions, and accelerates integration planning.
In this guide, we’ll explain what cybersecurity due diligence is, why it matters, and which areas are typically assessed. We’ll cover the step-by-step process, provide an actionable checklist, highlight industry-specific considerations, and outline how to choose the right provider. Finally, we’ll show how Cybri’s penetration testing expertise add depth to due diligence engagements.
What is Cybersecurity Due Diligence?
- Mergers and Acquisitions (M&A): Surface hidden breaches, weak cloud controls, or risky vendors that could lower deal value.
- Vendor Risk Management: Since “62% of breaches originate from third parties” [5], evaluating vendor cybersecurity practices before onboarding is a must.
- Investment Decisions: Private equity and venture firms benchmark portfolio maturity to avoid inherited liabilities.
- Compliance Checks: In healthcare, finance, and SaaS, confirm controls meet HIPAA/PCI/GLBA/SOC 2.
| Focus Area | IT Due Diligence | Cybersecurity Due Diligence |
| Primary Goal | System performance, scalability, cost efficiency. | Security posture, resilience, and compliance gaps. |
| Key Questions | Do the systems work, and are they cost-effective? | Are the systems secure, and could risks threaten the deal? |
| Scope | Hardware, software, infrastructure, IT budgets. | Vulnerability management, breach history, vendor risk. |
| Business Impact | Informs IT investment and integration costs. | Identifies liabilities that can trigger fines or lawsuits. |
| Outcome for Transactions | Operational efficiency and scalability insights. | Risk-adjusted valuation and remediation roadmap. |
In short: IT due diligence asks if systems work; cybersecurity due diligence asks if they’re safe.
Why Cybersecurity Due Diligence Matters
Cybersecurity due diligence is no longer optional. It’s a board-level priority that directly influences deal success, valuation, and long-term business resilience. The rationale is clear: digital risks can quickly translate into financial, operational, and reputational damage.
Due diligence uncovers gaps i.e., hidden breaches, misconfigured cloud, poor vendor controls that can expose data and turn a promising investment into a liability. Effective due diligence also reduces the risk of GDPR/HIPAA/PCI fines that “can reach millions of dollars per incident” [7].
The stakes extend well beyond compliance. In M&A contexts, weak security can collapse deals or force renegotiation. Research by Forescout found that “over half of M&A participants encountered critical cybersecurity risks in target companies that put deals in jeopardy” [7]. Identifying risks early gives buyers leverage to demand remediation, adjust price, or shift liability while sellers with strong controls can justify higher valuations.
Certain industries face even sharper consequences:
- Healthcare & MedTech: Breaches of protected health information (PHI) can trigger HIPAA fines, lawsuits, and loss of patient trust.
- Financial Services & FinTech: Insecure payment systems or poor data handling can expose firms to PCI DSS/SOX violations, regulatory action, and fraud.
- SaaS Providers: Weak multi-tenant isolation, insecure APIs, or poor access controls can block SOC 2 certification, delaying enterprise contracts and revenue.
Key Areas Covered in Cybersecurity Due Diligence
Governance & Policies
Strong governance sets the tone for security maturity. This includes documented policies and adherence to standards such as SOC 2, HIPAA, and GDPR. According to Forescout, “81% of decision makers say they now place more focus on a target’s cybersecurity posture than in the past, underscoring how policy gaps can directly affect deal confidence” [7].
Infrastructure & Cloud Security
Acquirers must review how networks, servers, endpoints, and cloud platforms are configured. Mismanaged Active Directory, weak identity controls, or insecure cloud deployments can expose integrated systems. PwC notes that “integration failures often arise when cybersecurity capabilities in areas like identity management or data loss prevention are not aligned across merging organizations, leading to costly remediation and delayed synergies” [3].
Application Security
Application-level risks like outdated code, insecure APIs, or unpatched vulnerabilities can expose customer data and intellectual property. Reviews should reference recognized frameworks such as the OWASP Top 10, which highlights the most critical web application risks. Secure code reviews, vulnerability scans, and penetration testing validate whether software can withstand real-world attacks.
Data Protection & Privacy
Encryption, access management, and data-handling protocols are essential to meet compliance requirements and protect sensitive assets. Undisclosed breaches of personal data are particularly damaging: “73% of decision makers said such a breach would be an immediate deal-breaker in their M&A strategy” [6].
Third-Party & Vendor Risks
Third-party dependencies from cloud providers to payment processors expand the attack surface. Forescout found that “connected devices and vendor systems were among the most likely to be overlooked in asset inventories, creating hidden risks that emerge only after integration” [7]. Supply-chain breaches have proven costly: “the SolarWinds attack compromised over 18,000 organizations worldwide” [8], illustrating how a single vendor weakness can cascade into widespread exposure.
Incident Response & Recovery
Finally, acquirers should evaluate breach history, disaster recovery and incident response plans. “Nearly two-thirds of surveyed companies admitted they later regretted acquisitions due to cyber concerns, often tied to inadequate response processes” [7].
The Cybersecurity Due Diligence Process (Step by Step)
1. Scoping & Information Gathering ( ≈ 1 week)
Define scope and objectives with buyers, advisors, and security teams whether your goal is compliance verification, risk exposure, or valuation impact. Typical inputs include:
- Policies, network diagrams, and architecture documents
- Cloud tenant inventories and IAM lists
- Contracts with third-party providers
- Incident logs and past audit results
2. Risk Assessment ( ≈ 1-2 weeks)
Review the target’s overall security maturity by analyzing prior incidents, control effectiveness, and regulatory obligations. Risks are categorized by likelihood and impact to create a register that highlights:
- Known vulnerabilities or ongoing threats
- Gaps in compliance (e.g., HIPAA, PCI DSS, SOC 2)
- Business impacts such as potential fines, brand damage, or customer attrition.
Frameworks like NIST CSF and ISO 27001 are often used to structure this step.
3. Technical Assessments ( ≈ 2 weeks)
Validate controls with hands-on testing. Methods often map to MITRE ATT&CK techniques for adversary simulation. Activities include:
- Vulnerability scanning of networks and endpoints
- Cloud configuration reviews (IAM, Active Directory, security groups)
- Application and API testing for OWASP Top 10 risks
- Encryption and data protection checks
- Vendor and supply chain security assessments
4. Reporting & Recommendations ( ≈ 1 week)
Consolidate findings into a report tailored for both executives and technical teams. Deliverables include:
- Executive summary with deal implications
- Detailed findings with severity ratings and evidence
- Prioritized remediation plan with clear owners and timelines
5. Remediation & Post-Transaction Monitoring (ongoing, 30-90 days+)
Due diligence does not end with the report. Best practice involves:
- Retesting fixes for validation
- Establishing Day 1 security actions for integration
- Setting 30/60/90-day milestones for long-term improvements
- Implementing continuous monitoring of cloud, identity, and vendor risks
Pre- and Post-Transaction Cybersecurity Due Diligence
Cybersecurity due diligence is not limited to a single checkpoint. It should be viewed as a lifecycle that begins before the transaction is signed and continues through integration and beyond. Both phases serve distinct purposes:
| Aspect | Pre-Transaction | Post-Transaction |
| Objective | Identify risks affecting valuation or terms | Secure integration and reduce inherited risks |
| Activities | Policy/document review, compliance checks, technical assessments | Remediation, alignment, monitoring |
| Common Findings | Undisclosed breaches, weak cloud setups, risky vendor dependencies | Integration misconfigurations, identity/access conflicts |
| Impact on Deal | Adjust price, add warranties, or delay negotiations | Remediation costs, delays integrations, reputational risk |
| Stakeholder Priority | Deal teams, legal counsel, external auditors | Security teams, IT operations, compliance officers |
Consider a SaaS company acquiring a smaller competitor. During the pre-transaction review, documentation and certifications appeared in order. However, shortly after closing, the buyer’s security team uncovered dozens of unmanaged cloud accounts used by developers—shadow IT. These accounts lacked MFA and logging, creating openings for attackers. Addressing the issue required urgent remediation, delaying product integration by several months and adding unplanned costs.
This illustrates why due diligence must continue after the deal closes. What looks clean on paper may reveal critical weaknesses once systems are integrated.
Cybersecurity Due Diligence Checklist (Actionable Resource)
Use this checklist as a starting point when evaluating an acquisition, vendor, or investment. Focus first on must-haves that directly influence valuation, then layer in advanced checks for deeper assurance.
Must-Have Checks (Top Priorities)
- Governance & Compliance: Review security policies and verify certifications (SOC 2, ISO 27001, PCI DSS, HIPAA).
- Incident History & Response: Request breach logs (past 24–36 months) and confirm a tested incident response plan.
- Cloud & Infrastructure Security: Check IAM (MFA, privileged access), core configurations, and network protections (firewalls/WAF).
- Application Security: Review recent penetration tests and ensure secure SDLC practices cover OWASP Top 10 risks.
- Data Protection & Privacy: Validate encryption (at rest/in transit) and compliance with GDPR/HIPAA/PCI obligations.
- Third-Party Risk: Vet critical vendors and confirm breach notification and right-to-audit clauses in contracts.
Advanced Checks (Deeper Assurance)
- Vulnerability & Patch Management: Inspect scan reports, patch SLAs, and exceptions.
- Backup & Recovery: Confirm immutability and test results against RTO/RPO targets.
- Legal & Insurance: Review warranties, remediation obligations, and cyber insurance coverage.
- Privacy & Compliance Depth: Examine DPIAs, consent handling, and cross-border data transfers.
- Supply Chain Monitoring: Use SIG/CAIQ or external assessments for continuous oversight.
Industry-Specific Considerations
Cybersecurity due diligence must reflect the realities of each sector. Different industries carry different threat profiles, regulatory obligations, and technology dependencies. Addressing these distinctions ensures risks are evaluated in the right context.
Healthcare & MedTech
- Confirm compliance with HIPAA and protection of patient health information (PHI).
- Review safeguards around electronic health records and connected medical devices.
- Assess critical vendor dependencies such as equipment suppliers and cloud-based health platforms.
- Ensure continuity plans protect patient care during a cyber incident.
Financial Services & FinTech
- Validate alignment with PCI DSS, SOX, and oversight from regulators such as OCC and FDIC.
- Examine payment systems, trading platforms, or digital banking apps for vulnerabilities.
- Assess fraud prevention controls and monitoring of privileged access to customer data.
- Review incident escalation processes involving regulators and financial authorities.
SaaS Providers
- Confirm SOC 2 compliance and evidence of ongoing monitoring.
- Evaluate multi-tenant isolation controls to prevent data leakage between customers.
- Assess API and third-party integration security.
- Check cloud posture management and identity access practices for scale and resilience.
Manufacturing & Critical Infrastructure
- Review risks tied to OT/ICS systems, where downtime directly impacts production.
- Assess safeguards around IT–OT convergence, including remote access to industrial systems.
- Evaluate supply chain resilience, focusing on critical vendors and logistics partners.
- Confirm disaster recovery plans extend to both IT and operational systems.
Choosing a Cybersecurity Due Diligence Vendor
Selecting the right partner is critical. A strong vendor goes beyond compliance checklists to uncover hidden risks that directly influence valuation, integration, and long-term stability. When evaluating providers, consider the following factors:
| Evaluation Factor | What to Look For |
| Technical Expertise | Teams with hands-on cybersecurity backgrounds, not just auditors or compliance staff. |
| Penetration Testing Capability | Ability to simulate real-world attacks on apps, APIs, and cloud infrastructure. |
| Business Alignment | Reports that connect findings to deal value, costs, and regulatory obligations. |
| Industry Knowledge | Familiarity with sector-specific risks (e.g., HIPAA for healthcare, SOC 2 for SaaS). |
| Post-Engagement Support | Guidance on remediation, validation testing, and integration planning. |
Many firms provide due diligence as a paper exercise, reviewing policies and certifications without validating whether controls actually work. Cybri distinguishes itself by adding technical depth to due diligence. Our team of certified penetration testers combines hands-on assessments with business-focused reporting, ensuring risks are not only discovered but also explained and prioritized. This gives acquirers a clearer view of how cybersecurity affects deal value, integration costs, and long-term resilience.
Key Outcomes of a Cybersecurity Due Diligence Engagement
A strong cybersecurity due diligence engagement produces outcomes that decision-makers can act on and not just technical detail for IT teams. The process typically results in a risk report with prioritized findings, where issues are ranked by severity and linked to business impact. This helps executives focus on valuation risks.
The second outcome is a deal impact assessment, which translates security weaknesses into financial and operational terms. Buyers see how cyber gaps influence purchase price, integration costs, or compliance obligations. Research shows “that 65% of companies regret completed M&A deals due to overlooked cyber risks” [9], underlining why this step directly affects ROI.
Another deliverable is a set of recommendations for remediation. These include clear next steps, accountable owners, and timelines. The report becomes a remediation roadmap before and after signing.
Finally, a strong engagement provides an ongoing monitoring plan. This often includes 30/60/90-day integration milestones and continuous oversight of cloud, identity, and vendor environments. This extends visibility beyond the transaction and builds leadership confidence.
These outcomes are more than technical findings—they are strategic insights that shape negotiations, influence price adjustments, and strengthen post-deal performance.
Frequently Asked Questions
To identify security risks that could affect deal value, compliance, or integration success before signing.
Policy review, infrastructure and cloud security checks, application testing, data protection, vendor risk, and incident response maturity.
Typically 2–6 weeks, depending on the scope, size of the target, and access to documentation.
Commonly ranges from $30k–$100k+, based on company size and depth required.
Due diligence is broad, covering policies, processes, and risks across the organization. Penetration testing is one technical method used within that review to validate controls.
As early as possible in the deal process—ideally during pre-signing negotiations—to surface risks that may affect terms or valuation.
Cybri: Your Go-to Penetration Partner for Cybersecurity Due Diligence
Cybersecurity due diligence protects deal value, ensures business continuity, and prevents costly surprises. Skipping it can leave acquirers exposed to breaches, fines, and integration delays.
Cybri brings expert-led, manual-first testing to the process. Our certified specialists go beyond policy reviews to simulate real-world attacks on applications, APIs, and cloud infrastructure. Through our real-time PTaaS dashboard, clients collaborate with testers as findings emerge and are not waiting weeks for a static report.
We combine this hands-on approach with experience across SaaS, Fintech, Healthtech and other industries, ensuring our work aligns with the risks most relevant to your industry. The result is a business-focused report that ties technical findings directly to financial and operational impact, giving decision-makers confidence before signing and guidance after closing.
If you’re evaluating a deal, vendor, or investment, Cybri ensures your due diligence is both technical and strategic. Schedule a consultation today to see how our penetration testing uncovers risks other due diligence reviews miss.
References
- Reuters. (February 21, 2017). Verizon, Yahoo agree to lowered $4.48 bln deal following cyber attacks
- Reuters. (October 30, 2020). ICO fines Marriott 18.4 million pounds for failing to secure customer data
- PwC. (2018). When cyber threatens M&A: How to minimize disruption risks and maintain deal value
- Deloitte. (2021). Due diligence for Mergers and Acquisitions through a cybersecurity lens
- Verizon. (2022). Data Breach Investigations Report
- European Union. (2018). General Data Protection Regulation (GDPR)
- Forescout. (2020). Cybersecurity concerns on merger and acquisition activity
- Centre for Cyber Security. (2021). SolarWinds: State-sponsored global software supply chain attack
- Securithink. (2022). Avoid M&A Buyer’s Remorse from Cybersecurity
