Cyber security threats are a constant pressure on UK organisations – not just in IT, but across operations, finance, legal, HR and beyond. In 2025, we saw cyber attacks bring down logistics providers, compromise millions of customer records, and trigger full-blown service outages at major brands like M&S and the Co-op.
These incidents often began with something simple: a phishing email, a misconfigured cloud system, or a contractor’s account left active too long. And with AI now helping attackers move faster and appear more credible, the cyber security threats facing UK businesses in 2026 are more widespread and harder to spot than ever.
This list sets out the top 10 cyber security threats for UK organisations in 2026 – based on real breaches, current trends, and expert predictions. It’s designed to help leadership teams prioritise where to focus, what to prepare for, and how cyber attacks are evolving.
1. Phishing and Social Engineering
Phishing – where attackers trick employees into clicking links, sharing credentials, or approving fake requests – remains the most common entry point in cyber attacks. According to UK government data, 85% of organisations that suffered a breach in 2025 said phishing played a role.
These scams are getting harder to spot. Criminals now use real names, job titles and insider language – often gathered from public sources like LinkedIn or company websites – to make messages sound legitimate. Some impersonate senior staff, others mimic suppliers or government agencies. AI is also making this easier, helping attackers generate tailored, well-written messages at speed.
Phishing works across every part of a business – from finance and HR to IT and customer service. And while filters and detection tools help reduce the volume, spotting the most convincing scams still relies on people knowing how these tactics work. In 2026, organisations that prioritise that awareness will be far better placed to stop attacks before they escalate.
2. Ransomware and Extortion Campaigns
Ransomware continues to be one of the most damaging types of cyber attack, with UK businesses among the hardest hit. In 2025, major incidents at Marks & Spencer and the Co-op showed how attackers steal sensitive data first, then threaten to leak it unless a ransom is paid. M&S faced months of disruption and lost hundreds of millions in profit, while the Co-op had the data of over 6.5 million members stolen and exposed.
Ransomware groups now operate like businesses – outsourcing access, negotiating through chat portals, and publicly naming victims who don’t pay. Most attacks now involve double extortion: not just encrypting systems, but also stealing data and threatening to leak it. This increases pressure on victims by adding legal, reputational, and regulatory risk alongside operational disruption.
In 2026, we’re likely to see more triple-extortion tactics – where criminals also threaten customers, suppliers or legal escalation. Ransomware will remain a top cyber threat to business, especially in sectors where service disruption has immediate consequences.
3. Helpdesk and Identity Impersonation
Some of the most effective breaches in 2025 started not with malware, but with a convincing phone call. Attackers posed as employees or contractors, contacting helpdesks to request password resets or new access tokens.
Attackers gather real details from LinkedIn, email leaks or previous breaches, sometimes using deepfake voice calls to sound authentic. Once inside, they can bypass multi-factor authentication using stolen tokens or service overrides.
In 2026, identity-based cyber security threats will continue to rise. Securing helpdesks means having strong verification steps, trained support staff, and clear escalation processes when something doesn’t feel right.
4. Supply Chain and Third-Party Breaches
In 2025, attackers increasingly breached suppliers to reach bigger targets. The ransomware attack on logistics firm Peter Green Chilled disrupted deliveries to Tesco, Aldi and Sainsbury’s. A separate attack on education provider Pearson exploited a developer tool to steal terabytes of sensitive partner data.
Smaller vendors often have weaker defences but still hold the keys – credentials, integrations, or privileged access. In 2026, supply chain cyber threats are expected to intensify, especially in sectors like logistics, finance and education.
Mapping supplier risk, understanding access, and enforcing minimum security standards are now baseline controls for business continuity.
5. Compromised Credentials and MFA Weakness
Weak or stolen passwords remain one of the simplest ways for attackers to break in – and in 2025, they were behind thousands of UK breaches. Attackers exploited old accounts, reused passwords, or default credentials left unchanged.
Even multi-factor authentication (MFA), once seen as a strong defence, is no longer foolproof. Attackers now use techniques like MFA fatigue (sending repeated login prompts until users approve one by mistake), or token theft, where session cookies are stolen to bypass login entirely. In some cases, helpdesks were tricked into resetting MFA altogether.
Heading into 2026, protecting against credential-based cyber threats means using phishing-resistant MFA, auditing user access, and applying tighter session controls.
6. Legacy Systems and Forgotten Data
Old systems and neglected data are quietly exposing many businesses to avoidable risk. In 2025, Oxford City Council suffered a breach that accessed 20 years of election records stored on outdated infrastructure. Pearson’s breach was triggered by an exposed, forgotten developer token.
Legacy systems often sit outside patching schedules or ownership, yet still contain sensitive data. Attackers actively scan for these forgotten assets, looking for easy access into core networks.
In 2026, organisations need to treat legacy tech as live risk. That means auditing what’s online, retiring what isn’t needed, and properly securing what remains.
7. Nation-State and Hacktivist Attacks
State-backed cyber threats became more visible in 2025. UK authorities linked attacks to groups aligned with Russia, China, Iran and North Korea – targeting government, healthcare, education, legal and infrastructure sectors.
These threats vary in sophistication. Some aim to steal data, others to disrupt or retaliate. Hacktivist groups also launched DDoS attacks and website defacements against UK organisations over political alignment.
In 2026, any organisation with ties to public services, critical supply chains, or international partners may find itself in scope – whether or not it considers itself a target. These threats may not come with obvious red flags, so preparation is key: strong detection, resilience planning, and board-level awareness are all essential to staying ahead of politically motivated attacks.
8. Cloud Misconfiguration and Asset Sprawl
Cloud platforms now underpin most UK businesses – but many are operating with visibility gaps. In 2025, breaches were often caused by misconfigured storage, over-permissioned accounts, or forgotten cloud environments.
As organisations scale across multiple cloud providers, tools, and development teams, tracking what’s live – and who has access to it – becomes increasingly difficult. In one common scenario, test systems are left running with real data, or API keys are stored in public repositories. Attackers are actively scanning for these weak points using tools like Shodan and Censys.
In 2026, cloud misconfiguration will remain one of the most preventable cyber security threats. Clear asset inventories, access controls, and defined ownership are key.
9. AI-Driven Attacks and Deepfakes
AI is already part of how attackers work. In 2025, we saw it used to write polished phishing emails, clone internal tone, and generate deepfakes of executives to support scams. These techniques made social engineering faster to execute and harder to detect.
Looking ahead, AI will support faster, more scalable cyber attacks – including automated reconnaissance, malware generation, and real-time social engineering. Fake messages, calls and even video could soon be used to trick staff into taking action.
Traditional red flags like awkward language or poor formatting no longer apply. In 2026, organisations will need better controls and trained teams to spot high-quality, AI-enabled threats.
10. Cookie Theft and Session Hijacking
In 2025, attackers began shifting from password theft to session hijacking – stealing authentication tokens or browser cookies to take over active logins. These attacks allow access without credentials or MFA.
Session hijacking is particularly dangerous in cloud-based environments, where a single token may grant access to email, finance and admin systems. As more businesses adopt single sign-on, the appeal of this method grows.
In 2026, defending against session-based threats will require device security, shorter session lifespans, and user awareness that “already logged in” doesn’t mean safe.
Conclusion
Cyber threats in 2026 will look a lot like those we saw in 2025 – phishing, ransomware, identity fraud and data breaches – but carried out faster, more convincingly, and with more pressure behind them. Most of the damage isn’t caused by complex hacking. It comes from familiar weaknesses: staff being tricked, credentials left exposed, suppliers not being checked, and systems no one’s maintaining.
Protecting against these threats requires capability. Businesses need people who understand where risks come from, how attacks unfold, and what to do when something doesn’t look right. That’s why our Cyber-First Apprenticeships are built to develop exactly those skills – practical, relevant, and grounded in the day-to-day realities of working in IT.
If you’re expanding your IT team or want to build long-term resilience, we’d love to help.