A company is acquired. The contracts have been reviewed, the financial figures analyzed, and the purchase completed. It is only months later that it becomes clear: The IT environment had already been compromised. This article explains, in a clear and practical way, why cybersecurity is a critical component of every M&A transaction today.

Today, cyber risks are among the key factors in mergers and acquisitions (M&A). Undetected vulnerabilities, ongoing cyberattacks, or regulatory shortcomings in the wake of a merger can directly impact a company’s value and jeopardize the success of a transaction. Particularly critical are vulnerabilities that only become apparent after closing and then fall entirely under the buyer’s responsibility.

Due Diligence: Value Protection, Transaction Security, and Decision-Making Foundations for Investors

As part of a cybersecurity due diligence process, security-related risks of the target company are systematically analyzed. The results provide transparency regarding the actual level of security maturity, support purchase decisions, and help avoid risks after the transaction is completed.

A structured cybersecurity due diligence provides transparency regarding the target company’s actual security maturity level. It delivers reliable decision-making criteria for management and decision-makers, reduces liability risks, and protects corporate value.

The Five Most Critical Cyber Risks in M&A

In the context of M&A transactions, cyber risks typically arise in five particularly critical areas:

Hidden cyberattacks: APTs (Advanced Persistent Threats) or undetected data breaches may be acquired along with the target company.
Compliance Gaps: Regulatory requirements such as data protection laws, industry-specific guidelines, or new cybersecurity regulations like NIS2 can pose additional risks in cross-border transactions.
Legacy systems & shadow IT: Outdated or incompletely documented IT structures increase the attack surface and result in high costs during post-merger integration.
Third-Party Risks: Insecure suppliers or service providers can become a vulnerability within the supply chain.
Lack of Responsiveness: Without incident management, cyber incidents can lead to longer downtime and higher costs.

These risks directly impact the purchase price, contract terms, and integration costs.

Structured Approach: What a Cybersecurity Due Diligence Must Achieve

A cybersecurity due diligence follows a structured approach so that investors, management, and other decision-making bodies can quickly obtain a robust, transparent picture of a target company’s security maturity level. This involves assessing technical risks, organizational processes, and regulatory requirements.

Structured Analysis in Four Steps

Step 1: Initialization & Scoping

Kick-off Workshop
Document Request
Risk and Compliance Focus

At the outset, the audit’s objectives, scope, and relevant stakeholders are defined. These include, among others, IT managers, compliance teams, and security managers. In addition, relevant documents such as security policies, audit reports, or existing security concepts are analyzed. Special focus is placed on critical assets such as customer data, intellectual property, and business-critical systems.

Step 2: Conducting the Assessments

Modular Assessment of the IT Landscape
Technical Analyses
Interviews & Workshops

Based on the defined scope, a technical and organizational assessment of the IT landscape is conducted. Depending on the requirements, various testing methods are used—for example, automated security analyses, penetration tests, log evaluations, or interviews with IT managers. Among other things, security incidents, authorization structures, and existing management processes are examined.

Step 3: Analysis & Risk Assessment

Risk Register
Evaluation
Prioritization of Risks and Mitigation Measures

All findings are compiled into a structured risk register and assessed in terms of likelihood of occurrence and impact. The identified risks and potential measures are then prioritized—for example, to improve patch management, security processes, or governance structures.

Step 4: Reporting & Handover

Management Summary
Technical Report
Presentation

Theresults are tailored to the intended audience: A management summary highlights the most critical risks and recommendations for decision-makers, while a technical report documents detailed findings and evidence. The final presentation of the results to the steering committee facilitates joint evaluation and decision-making.

Whether it’s M&A, transformation, or risk assessment: Cyber risks can only be evaluated if they are systematically analyzed. Our assessments and strategy services create transparency and help you identify cyber risks early on and make informed decisions.

Modular assessment modules for varying requirements

Not every transaction requires the same scope of review. The scope and depth of a cybersecurity due diligence depend, among other factors, on company size, industry, regulatory environment, and planned integration model.

Typical audit modules include:

ISO 27001:2022 Assessment
Assessment of the information security management system (ISMS), particularly in regulated industries or for companies operating internationally. The focus includes security controls, risk management, and the implementation of relevant requirements.

Key areas: ISMS maturity level, control assessment (Annex A), risk management.
Deliverables: Compliance report , action plan.

Microsoft 365 Assessment
Analysis of the security and compliance configuration of the Microsoft 365 environment. Areas examined include identity management, multi-factor authentication, data classification, and security features such as Microsoft Defender.

Key Areas: Identity management (Azure AD, MFA), data classification (DLP), security configuration (Defender for Endpoint).
Deliverables: Best-practice checklist, risk analysis, optimization recommendations.

External Penetration Test
Identification of immediately exploitable vulnerabilities in externally accessible systems such as web applications, APIs, or networks. This allows for the assessment of acute technical risks before a transaction is completed.

Focus areas: Black-box testing, scope (IP addresses, web applications, APIs).
Deliverables: Penetration test report, prioritized list of vulnerabilities.

Compromise Assessment
Forensic investigations help identify existing compromises or undetected attacker activities before closing the deal. This reduces the risk of inheriting existing cyber incidents when acquiring a company.

Focus areas: Forensic analysis, log analysis.
Deliverables: Forensic report, recommendations for action.

Current Best Practices & Trends in Cybersecurity Due Diligence

Three developments are having a particularly strong impact on cybersecurity due diligence in the M&A environment:

Early Involvement as a Deal Enabler:
Increasingly, security assessments are being incorporated at an early stage into strategy and target evaluation. This allows risks to be identified early, surprises to be avoided, and transactions to be better prepared.
Regulatory requirements are increasing:
New and existing regulations in the EU and Switzerland are increasing the importance of robust cyber risk assessments. Companies must increasingly be able to demonstrate that security risks are identified, assessed, and appropriately addressed.
Post-Merger Integration as a Key Risk Factor:
Differing security levels and cultures delay integrations. Security objectives defined early on and a clear integration strategy help reduce risks after the acquisition and are critical to long-term success.

The Strategic Value for Buyers and Investors

Cybersecurity due diligence is no longer merely a technical review. It supports strategic decisions throughout the entire M&A process—from the initial evaluation of a target company to successful integration.

It creates measurable added value by:

Protecting corporate value
Better decision-making foundations for purchase price and contract structuring
Reducing liability and reputational risks
Faster and more secure post-merger integration

Conclusion: Well-informed M&A decisions based on robust cyber risk assessments

Cybersecurity is now a critical component of every M&A transaction—and the early identification of cyber risks helps reduce financial, operational, and regulatory risks.

A structured cybersecurity due diligence process provides the necessary transparency regarding a target company’s actual security maturity level and delivers a robust foundation for strategic decisions, from the initial assessment through to successful post-merger integration.

At the same time, it supports informed decisions regarding purchase price, contract drafting, and integration planning, and helps secure long-term enterprise value and resilience.

Cybersecurity is therefore not a technical detail, but an essential component of corporate valuation. Those who address digital risks early on create the conditions for well-informed M&A decisions and lay the foundation for a successful and secure integration.

We are passionate about actively supporting you throughout your M&A process— please feel free to contact us at any time!