The Biggest Cyber Security Threats Facing Businesses Today

The adoption of cloud services, connected devices, remote working and business applications has expanded the number of systems that organisations need to protect. Every internet-facing application, employee account, endpoint and third-party connection can introduce potential security weaknesses if not properly managed.

Cybercriminals do not exclusively target large corporations. Small and medium-sized businesses can also be attractive targets because they may have limited security resources, outdated systems or insufficient access controls. Attackers may exploit these weaknesses to steal information, compromise business accounts, demand ransom payments or gain access to larger organisations through supplier relationships.

As a result, businesses need to understand the threats affecting their industry and assess how their technology, people and external dependencies could be exposed.

Phishing attacks use fraudulent emails, messages or websites to trick employees into revealing login credentials, downloading malicious files or transferring money. Business Email Compromise (BEC) takes this further by impersonating executives, employees or suppliers to manipulate payment instructions and business transactions.

Ransomware is malicious software that encrypts business data or systems and demands payment for their release. Some attackers also steal confidential information and threaten to publish it. Other malware, including spyware and trojans, can monitor activity, steal information or provide unauthorised access to business networks.

Cybercriminals increasingly exploit artificial intelligence to create convincing phishing messages, impersonate voices and produce realistic fake videos. Deepfake impersonation can make fraudulent payment requests or executive instructions appear legitimate, increasing the risk of financial fraud and unauthorised transactions.

Stolen usernames, passwords and authentication tokens can allow attackers to access corporate email, cloud applications and sensitive business systems. Credential stuffing, password spraying and session hijacking are techniques used to compromise accounts, particularly where authentication and access controls are weak.

Misconfigured cloud storage, excessive user permissions and insecure application interfaces can expose confidential business information. Supply-chain attacks create another route into organisations when attackers compromise a software provider, supplier or external service with access to business systems.

Insider threats can originate from employees, contractors or other individuals with legitimate access to business resources. Data may be exposed intentionally through theft or accidentally through unsafe sharing, misdirected emails and poor security practices. Unusual downloads and transfers of large volumes of information can indicate potential data exfiltration.

Outdated operating systems, applications and network devices may contain known security weaknesses that attackers can exploit. Zero-day vulnerabilities are flaws exploited before an effective security patch is available. Without timely updates and vulnerability management, business systems can remain exposed to attacks that compromise data and disrupt operations.

Cyber attacks can result in direct financial losses through fraudulent payments, ransom demands, recovery expenses and business interruption. Ransomware or compromised systems may prevent employees from accessing essential applications, delaying projects, disrupting customer services and reducing productivity.

Organisations may also need to invest in forensic investigations, system restoration, external security support and additional protective measures. For small and medium-sized businesses, unexpected recovery costs can place considerable pressure on financial resources.

A data breach can expose customer details, employee records, financial information and intellectual property. Under the UK GDPR and Data Protection Act 2018, organisations handling personal data must meet applicable security and breach-reporting obligations.

Where a personal data breach is reportable, organisations generally need to notify the Information Commissioner's Office (ICO) within 72 hours of becoming aware of it, where feasible. Failure to meet applicable data protection requirements can lead to regulatory action and financial penalties.

Beyond regulatory consequences, customers may lose confidence in a business that fails to protect their information. Rebuilding trust, retaining customers and restoring supplier relationships can take considerably longer than recovering the affected IT systems.

In April 2025, the UK's Legal Aid Agency identified a cyber attack affecting its online services. A subsequent investigation established that attackers had accessed and extracted a significant amount of personal data relating to legal aid applicants, including sensitive information. The incident highlighted the importance of protecting public-facing systems and monitoring access to sensitive records.

In October 2026, ASOS investigated unauthorised activity involving third-party customer notification platforms. The incident involved access to basic customer information, including names and contact details. ASOS restricted access to the affected platforms and worked with specialist advisers and relevant authorities.

These incidents highlight two important lessons: businesses must secure their own systems and carefully manage the external platforms and suppliers they rely on. Effective access controls, third-party security assessments and continuous monitoring can help organisations identify and contain suspicious activity.

Enforce multi-factor authentication (MFA), restrict administrator privileges and review user permissions regularly. Keep operating systems, applications and security software updated to address known vulnerabilities. Secure cloud platforms through appropriate access controls, encryption and regular configuration reviews.

Train employees to recognise phishing attempts, suspicious attachments and fraudulent payment requests. Establish clear procedures for reporting suspicious activity. Assess suppliers and external service providers before granting access to business systems, and review their permissions and security practices regularly.

Monitor user activity, networks and business applications for unusual behaviour. Maintain secure backups and test data recovery procedures to support business continuity. Develop an incident response plan that defines responsibilities, escalation procedures and recovery actions so teams can respond effectively when an attack occurs.

The UK Government's cyber security guidance for businesses and the NCSC's advice for small and medium-sized organisations provide practical recommendations for improving cyber resilience.

For more detail on ongoing protection, read our guide to how managed IT security improves cyber security and compliance.