UK Warned of Large Scale Hacktivist Attacks in Event of Conflict Cyber Chief Says

The United Kingdom could face widespread and highly disruptive cyberattacks if it becomes involved in a major conflict, according to a senior security official. Richard Horne, head of the National Cyber Security Centre, has warned that hacktivist attacks at scale could target British infrastructure, potentially causing damage comparable to recent high profile ransomware incidents.

Speaking ahead of the annual CyberUK conference in Glasgow, Horne is expected to highlight the evolving nature of cyber threats, with nation state actors now playing a leading role in major incidents handled by the agency. He cautioned that in a conflict scenario, cyberattacks could intensify significantly, with attackers using advanced techniques to disrupt services, steal data, and undermine public confidence. Unlike traditional ransomware attacks, however, such politically motivated campaigns may offer no straightforward path to recovery.

Hacktivist operations typically involve coordinated cyber efforts aimed at advancing political or ideological goals, often targeting government systems, critical infrastructure, and major corporations. Horne’s warning suggests that these attacks could become more sophisticated and widespread, mirroring the complexity of ransomware operations but without the option of negotiating or paying for system restoration. This raises concerns about prolonged disruptions and the resilience of key sectors in the face of sustained cyber pressure.

Recent ransomware incidents in the UK have already demonstrated the potential scale of disruption. Major organisations such as Marks & Spencer, Jaguar Land Rover, and Royal Mail have all been affected by cyberattacks in recent years. In some cases, these incidents led to operational delays, financial losses, and wider economic impact, underscoring the vulnerability of both public and private sector systems.

The warning comes as governments worldwide increasingly view cyber resilience as a critical component of national security. As geopolitical tensions rise, the likelihood of digital conflict alongside traditional military activity is becoming more pronounced. UK officials are urging organisations to strengthen their cybersecurity measures and prepare for more complex threat scenarios, as the boundary between cybercrime and state backed operations continues to blur.