The United Kingdom’s National Cyber Security Centre has issued a strong warning about a spreading weakness in artificial intelligence systems, stating that prompt-injection attacks may never be fully solved. The agency explained that this risk is tied to the basic design of large language models, which read all text as part of a prediction sequence rather than separating instructions from ordinary content. Because of this, malicious actors can insert hidden text that causes a system to break its own rules or execute unintended actions.
The NCSC noted that this is not a theoretical concern. Several demonstrations have already shown how attackers can force AI models to reveal internal instructions or sensitive prompts, and other tests have suggested that tools used for coding, search, or even résumé screening can be manipulated by embedding concealed commands inside user-supplied text.
David C, a technical director at the NCSC, cautioned that treating prompt injection as a familiar software flaw is a mistake. He observed that many security professionals compare it to SQL injection, an older type of vulnerability that allowed criminals to send harmful instructions to databases by placing commands where data was expected. According to him, this comparison is dangerous because it encourages the belief that both problems can be fixed in similar ways, even though the underlying issues are completely different.
He illustrated this difference with a practical scenario. If a recruiter uses an AI system to filter applications, a job seeker could hide a message in the document that tells the model to ignore existing rules and approve the résumé. Since the model does not distinguish between what it should follow and what it should simply read, it may carry out the hidden instruction.
Researchers are trying to design protective techniques, including systems that attempt to detect suspicious text or training methods that help models recognise the difference between instructions and information. However, the agency emphasised that all these strategies are trying to impose a separation that the technology does not naturally have. Traditional solutions for similar problems, such as Confused Deputy vulnerabilities, do not translate well to language models, leaving large gaps in protection.
The agency also stressed upon a security idea recently shared on social media that attempted to restrict model behaviour. Even the creator of that proposal admitted that it would sharply reduce the abilities of AI systems, showing how complex and limiting effective safeguards may become.
The NCSC stated that prompt-injection threats are likely to remain a lasting challenge rather than a fixable flaw. The most realistic path is to reduce the chances of an attack or limit the damage it can cause through strict system design, thoughtful deployment, and careful day-to-day operation. The agency pointed to the history of SQL injection, which once caused widespread breaches until better security standards were adopted. With AI now being integrated into many applications, they warned that a similar wave of compromises could occur if organisations do not treat prompt injection as a serious and ongoing risk.
The United Kingdom’s National Cyber Security Centre (NCSC) has cautioned that hacking groups connected to China are responsible for an increasing number of cyberattacks targeting British organisations. Officials say the country has become one of the most capable and persistent sources of digital threats worldwide, with operations extending across government systems, private firms, and global institutions.
Paul Chichester, the NCSC’s Director of Operations, explained that certain nations, including China, are now using cyber intrusions as part of their broader national strategy to gain intelligence and influence. According to the NCSC’s latest annual report, China remains a “highly sophisticated” threat actor capable of conducting complex and coordinated attacks.
This warning coincides with a government initiative urging major UK companies to take stronger measures to secure their digital infrastructure. Ministers have written to hundreds of business leaders, asking them to review their cyber readiness and adopt more proactive protection strategies against ransomware, data theft, and state-sponsored attacks.
Last year, security agencies from the Five Eyes alliance, comprising the UK, the United States, Canada, Australia, and New Zealand uncovered a large-scale operation by a Chinese company that controlled a botnet of over 260,000 compromised devices. In August, officials again warned that Chinese-backed hackers were targeting telecommunications providers by exploiting vulnerabilities in routers and using infected devices to infiltrate additional networks.
The NCSC also noted that other nations, including Russia, are believed to be “pre-positioning” their cyber capabilities in critical sectors such as energy and transportation. Chichester emphasized that the war in Ukraine has demonstrated how cyber operations are now used as instruments of power, enabling states to disrupt essential services and advance strategic goals.
Artificial Intelligence: A New Tool for Attackers
The report highlights that artificial intelligence is increasingly being used by hostile actors to improve the speed and efficiency of existing attack techniques. The NCSC clarified that, while AI is not currently enabling entirely new forms of attacks, it allows adversaries to automate certain stages of hacking, such as identifying security flaws or crafting convincing phishing emails.
Ollie Whitehouse, the NCSC’s Chief Technology Officer, described AI as a “productivity enhancer” for cybercriminals. He explained that it is helping less experienced hackers conduct sophisticated campaigns and enabling organized groups to expand operations more rapidly. However, he reassured that AI does not currently pose an existential threat to national security.
Ransomware Remains the Most Severe Risk
For UK businesses, ransomware continues to be the most pressing danger. Criminals behind these attacks are financially motivated, often targeting organisations with weak security controls regardless of size or industry. The NCSC reports seeing daily incidents affecting schools, charities, and small enterprises struggling to recover from system lockouts and data loss.
To strengthen national resilience, the upcoming Cyber Security and Resilience Bill will require critical service providers, including data centres and managed service firms, to report cyber incidents within 24 hours. By increasing transparency and response speed, the government hopes to limit the impact of future attacks.
The NCSC urges business leaders to treat cyber risk as a priority at the executive level. Understanding the urgency of action, maintaining up-to-date systems, and investing in employee awareness are essential steps to prevent further damage. As cyber activity grows “more intense, frequent, and intricate,” the agency stresses that a united effort between the government and private sector is crucial to protecting the UK’s digital ecosystem.
The UK is facing an increasing number of cyberattacks from Russia and China, with serious cases tripling in the past year, according to a new report by the National Cyber Security Centre (NCSC). On Tuesday, Richard Horne, the new NCSC chief, stated that the country is at a critical point in safeguarding its essential systems and services from these threats.
The report reveals a disturbing rise in sophisticated cyber threats targeting Britain’s public services, businesses, and critical infrastructure. Over the past year, the agency responded to 430 cyber incidents, a significant increase from 371 the previous year. Horne highlighted notable incidents such as the ransomware attack on pathology provider Synnovis in June, which disrupted blood supplies, and the October cyberattack on the British Library. These incidents underscore the severe consequences these cyber threats have on the UK.
Similar challenges are being faced by the UK’s close allies, including the U.S., with whom the country shares intelligence and collaborates on law enforcement. Horne emphasized the UK’s deep reliance on its digital infrastructure, which supports everything from powering homes to running businesses. This dependency has made the UK an appealing target for hostile actors aiming to disrupt operations, steal data, and cause destruction.
“Our critical systems are the backbone of our daily lives—keeping the lights on, the water running, and our businesses growing. But this reliance also creates vulnerabilities that our adversaries are eager to exploit,” Horne stated.
According to the report, Russia and China remain at the forefront of the UK’s cybersecurity challenges. Russian hackers, described as “reckless and capable,” continue to target NATO states, while China’s highly advanced cyber operations aim to extend its influence and steal critical data. Horne called for swift and decisive action, urging both the government and private sector to enhance their defenses.
Horne emphasized the need for more robust regulations and mandatory reporting of cyber incidents to better prepare for future threats. He stressed that a coordinated effort is necessary to improve the UK’s overall cybersecurity posture and defend against adversaries’ growing capabilities.