The Biggest Cybersecurity Threats to Watch in 2026

Introduction

Cyberattacks are hitting businesses at unprecedented levels. Nearly half of UK businesses (43%) reported experiencing a cyber breach or attack in the past 12 months. The UK’s National Cyber Security Centre (NCSC) even recorded a threefold increase in severe cyber incidents in the last year. It’s no wonder that almost 73% of business leaders believe a cybersecurity incident will disrupt their operations in the next two years.

As we enter 2026, the threat landscape continues to evolve, with cybercriminals adopting new tactics and technologies to outsmart defenders. Below, we break down the biggest cybersecurity threats in 2026 that companies in the UK (and beyond) should be watching closely, and why staying vigilant has never been more important.

Ransomware Attacks and Double Extortion

Ransomware remains perhaps the most notorious cyber threat to organisations and it’s only getting more aggressive. 2025 was a record year for ransomware and digital extortion incidents, with more victims identified than in any prior year, and early 2026 is on track to see even higher attack volumes.

Modern ransomware gangs don’t just encrypt your files anymore; they steal data and extort victims multiple times. Criminal groups now threaten to publish stolen data or even launch additional attacks (like DDoS) if victims refuse to pay, a tactic known as double (or triple) extortion. The impact of these attacks can be devastating. For example, a cyber-attack in 2025 forced Marks & Spencer to halt its online orders for almost seven weeks, causing a 20% drop in clothing sales that month.

Businesses must ensure they have robust data backups and incident response plans (and perhaps even cyber insurance). Being prepared is crucial because while paying a ransom is a bad idea, being offline for weeks could be an existential threat to any company.

Phishing Scams and Social Engineering

If cybercrime were a business, phishing would be its best-selling product. Phishing continues to dominate as the primary cause of security breaches, accounting for 85% of incidents in affected UK businesses. These are those deceptive emails (or texts and calls) that trick employees into clicking malicious links or divulging passwords.

In 2026, phishing schemes are evolving in two worrisome ways. Attackers now use artificial intelligence to craft highly personalised messages that mimic legitimate communications from trusted sources. Second, phishing has diversified beyond email. We’re seeing “smishing” (phishing via SMS), voice-call cons, and even QR code phishing (“quishing”) attempts. The human factor is a constant challenge, even tech-savvy people can be fooled by a well-crafted con. Ongoing staff awareness training and strong verification procedures are key to reducing this ever-present threat.

AI-Powered Attacks and Deepfake Deceptions

Advances in artificial intelligence aren’t just helping businesses, they’re also arming cybercriminals with new tools. In 2026, we expect to see AI-driven cyber attacks becoming more common and sophisticated. This includes malicious software that can learn and adapt to evade detection, or automated hacking bots that can probe systems far faster than any human.

Alarmingly, AI is also enabling a surge in deepfake scams and synthetic identity fraud. Deepfakes are hyper-realistic fake videos or audio clips, and criminals are using them to impersonate trusted people. This is no longer science fiction; it’s happening. Businesses should double-check unusual requests, even if they appear to come from a familiar face. In 2026, seeing will not always be believing.

Internet of Things (IoT) and Smart Device Vulnerabilities

From smart thermostats and CCTV cameras to voice assistants and industrial sensors, the Internet of Things has woven its way into modern offices and factories. By 2030, the UK is projected to have over 100 million IoT devices connected via ultra-fast networks. Each of those “smart” gadgets is essentially a tiny computer, and unfortunately many are not very secure. Hackers have exploited weakly protected IoT devices to hijack them into massive botnets that launch devastating DDoS attacks. Moreover, compromised IoT gadgets can serve as easy entry points into corporate networks if they aren’t properly configured and isolated.

The IoT revolution brings tremendous convenience, but it also expands the attack surface dramatically. Businesses should inventory and monitor all connected devices, keep their firmware up to date, and segregate IoT devices on separate networks.

Supply Chain Attacks on Vendors and Cloud Platforms

Some cyber threats sneak in via your suppliers and software partners. Supply chain attacks occur when threat actors breach a trusted third-party provider in order to infect many downstream victims at once. In these scenarios, an organisation can have strong security itself and still get compromised because a vendor in its ecosystem was the weak link.

Sadly, such indirect attacks are increasingly common. A 2025 study found that 58% of large UK financial services firms experienced at least one third-party supply chain attack in 2024, and nearly a quarter were targeted three or more times in that year. The appeal for hackers is obvious: why break into one company when you can breach a software provider or cloud platform that dozens or hundreds rely on?

To manage this threat, companies should rigorously vet their suppliers’ security measures, include cybersecurity requirements in vendor contracts, and have contingency plans in case a critical partner is breached.

Conclusion: Staying Prepared in 2026 and Beyond

If there’s a silver lining to the onslaught of cyber threats, it’s that awareness at the executive level has never been higher. Cybersecurity is increasingly seen as a core business issue, not just an IT problem. Many companies are shifting away from an outdated “prevent every breach” mindset and instead prioritising resilience and rapid recovery.

Initiatives from the NCSC encourage organisations to improve their cyber readiness, and similar efforts are underway in the US and EU. No matter where your business operates, strong cybersecurity practices and compliance are becoming non-negotiable.

The threats highlighted here are formidable, but they aren’t insurmountable. By staying informed, investing in up-to-date defences, and fostering a culture of security awareness, companies can significantly reduce their risk exposure. Stay safe out there!