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Anthropic AI’s Mythos triggers warnings over cyber risk

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Anthropic AI’s Mythos model has prompted warnings from cyber security specialists, heightening concerns about how generative AI could increase the scale and sophistication of cyberattacks.

The response follows reports that unauthorised users accessed Mythos by simply changing the model name. Security experts say the incident shows how quickly advanced AI systems can move beyond controlled environments into wider circulation.

Security leaders are urging boards and executives in the UK and elsewhere to treat AI-driven cyber risk as a strategic issue. They argue that recent developments expose both the fragility of AI infrastructure and the potential for these systems to industrialise existing cybercrime techniques.

Sujatha S Iyer, Head of AI Security at ManageEngine, Zoho’s IT division, said the emergence of tools such as Mythos should force organisations to rethink their assumptions about threat actors and the speed of attacks.

“As AI lowers the barrier of entry for cybercriminals, the baseline for defence must too rise. Anthropic AI’s Mythos model is a wake-up call – reminding us that cyber resilience isn’t just an IT issue. This is a priority that requires board-level attention,” said Sujatha S Iyer, Head of AI Security, ManageEngine, Zoho.

AI systems built for code analysis, content generation or research can also help attackers. Security professionals say these models can support malicious users with reconnaissance, phishing, vulnerability discovery and exploit development, even when guardrails are in place.

Iyer said AI is changing the mechanics and speed of common attack types, putting new pressure on organisations that still rely on traditional defences.

“We’re entering a phase where attackers can automate reconnaissance, personalise phishing at scale, and identify vulnerabilities faster than many organisations can respond. This fundamentally shifts the balance in favour of threat actors,” said Iyer.

Many businesses still depend on perimeter-based security architectures that assume a clear boundary between trusted internal systems and the outside world. But as cloud services, remote work and software-as-a-service platforms have expanded, that boundary has become less distinct.

Companies now face adversaries that can adapt their methods in near real time, Iyer said.

“What’s critical now is that businesses move away from reactive security models. Traditional perimeter-based approaches are no longer sufficient when threats are becoming more adaptive and intelligent. Instead, organisations need to prioritise continuous monitoring, identity-first security, and rapid incident response capabilities that can keep pace with AI-driven threats,” said Iyer.

Security teams are also focusing on basic operational processes, including patching, configuration management and staff training. Experts say AI-enabled attackers can rapidly scan public-facing systems for known flaws that remain unpatched.

Weaknesses in day-to-day practice often undermine investments in advanced tools, Iyer said.

“There’s also a growing need to strengthen cyber hygiene at every level of the organisation. Even the most advanced tools can be undermined by poor patch management or lack of employee awareness,” said Iyer.

Concerns about Mythos intensified after reports that external users had accessed the model without authorisation. The method described involved changing a model identifier rather than breaching infrastructure through more complex means.

Shane Fry, Chief Technology Officer at RunSafe Security, said the incident illustrates how exposed AI systems can become even when providers intend to limit access.

“Unauthorized users were able to access Anthropic’s Mythos model, reportedly by just changing a model name. Even if their intent is just to explore, it shows how easily these systems can be exposed. The reality is these AI capabilities are already out there, ‘hacked’ or not, and they’re going to accelerate how quickly vulnerabilities are found and exploited. Software teams will need to look at how to harden their code so those vulnerabilities can’t be used in the first place,” said Shane Fry, Chief Technology Officer, RunSafe Security.

Security practitioners say the Mythos episode raises questions about access control, monitoring and logging for advanced models. It also highlights how powerful AI systems, once exposed, can become part of the wider cyber ecosystem regardless of a vendor’s policies.

For UK organisations, the comments from Iyer and Fry reflect a broader shift in cyber security thinking. Boards are being asked to treat AI as both a tool for defence and a risk multiplier for adversaries.

Vendors and security teams are now assessing how AI models can be integrated into monitoring and response workflows without creating new attack surfaces. At the same time, they are examining how adversaries might use the same class of models to probe public infrastructure, corporate networks and the software supply chain.

Regulators in the UK and Europe have signalled tighter oversight for providers of advanced AI systems. The Mythos case is likely to feed into ongoing debates about model access, transparency and safety requirements.

The incident has also renewed attention on software hardening. Fry said teams maintaining critical systems will need to assume that automated vulnerability discovery will become faster and more accurate, whether through legitimate tools or models such as Mythos.

Security leaders now expect AI-enabled offensive tools to move into the mainstream of cybercrime. They say the balance between defenders and attackers will depend on how quickly organisations improve monitoring, identity controls and secure development practices.



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Boots takeover plans thrown into doubt after bid rejected

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The £7 billion bid by the Weston family to buy Boots is now at risk of collapsing, raising fresh uncertainty over the future of the pharmacy giant.

Talks between the Westons—one of the world’s richest retail families—and Boots’ private equity owners reached a standstill after the family lowered its offer, which was subsequently rejected.

The Westons revised their bid following Sigma Healthcare’s withdrawal from a rival bid in June, leaving them as the sole suitor for Boots.

People walking in front of the Boots pharmacy on Oxford StreetAcross the UK, Boots operates approximately 1,800 stores. (Image: Getty Images)

Boots takeover talks at risk of collapse

“It isn’t totally dead,” a source close to the matter told The Telegraph.

“It’s a stand-off.

“They tried to knock down the price after realising they were the only show in town.

“They came in with a lower number that was deemed unacceptable.

“The gap isn’t completely insurmountable.

“However, the owners won’t sell at any price.”

A source suggested that economic uncertainty had made the Westons more cautious.

The Westons’ business empire is split between the UK and Canada, with the Canadian side—which owns a controlling stake in Loblaw, Canada’s largest supermarket chain—leading the talks.

Boots’ ownership has been uncertain since Walgreens Boots Alliance was acquired by US private equity firm Sycamore Partners for £18 billion last year.

Following the deal, Boots was separated into a standalone business, prompting expectations of a sale or a return to public markets.

Italian billionaire Stefano Pessina and his family reinvested in the company during the carve-out.

Mr Pessina had previously teamed up with buyout giant Kohlberg Kravis Roberts to take Boots private in 2007 in what was the largest-ever private equity-led takeover of a UK-listed business at the time.

Before negotiations with the Westons and Sigma Healthcare, Sycamore Partners had considered relisting Boots on the London Stock Exchange after nearly two decades off the market.

It is believed that if sale talks break down, Sycamore will revive plans to float Boots next year.

Walgreens previously explored a sale in 2022, attracting interest from private equity firms including TDR Capital, which owns Asda.

However, those talks collapsed after bids failed to meet expectations.

Since then, Boots has closed hundreds of underperforming UK stores as part of a wider cost-cutting programme.

Investment has been redirected towards its core estate of 400 larger stores, primarily located in town centres and retail parks.

This core network is supported by smaller pharmacies and travel-focused locations.

Across the UK, Boots operates approximately 1,800 stores.

The company also owns beauty brands including No7 and Soap & Glory, and has become an increasingly important provider of NHS services, offering doctor consultations, vaccinations, blood-pressure checks, and specialised treatments for skin and hair loss.

In preparation for a potential public listing, Boots recently appointed Alex Baldock, former chief executive of Currys, as its new CEO, who is set to join the company this autumn.

The British arm of the Weston family controls Associated British Foods—parent company of Primark—and Fortnum & Mason through its Wittington Investments vehicle.

The family previously owned Selfridges for nearly 20 years before selling the department store for £4bn in 2022 to a consortium including Central Group of Thailand and Austrian property giant Signa Holding.

Both Sycamore Partners and Boots have declined to comment.

What is your favourite high street shop? Let us know in the comments.





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‘WH Smith’ chain rescue comes with ‘considerable risks’

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“This has all the hallmarks of an adventurous equity play,” wrote Mr Justice Hildyard in his judgment published yesterday after he last month approved the restructuring, which involves the closure of 150 of the books-to-paperclips retailer’s 450 stores.

He added that the group’s turnaround plans “might strike the sceptic as more in the nature of generic aspirations than concrete grounds for confidence in a successful outcome”.

The chain includes numerous former WH Smith branches across Oxfordshire.

These include stores in Cornmarket, Oxford, and in Witney, Abingdon, Chipping Norton, Didcot, Wantage and Banbury. The takeover came into effect a year ago.

READ MORE: Major high street retailer could collapse

“The execution risk is very considerable,” Mr Justice Hildyard said, indicating the £3m valuation of the company – compared with its acquisition value of about £40m only a year before – reflected the potential for high losses as well as high profits.

The retailer, which until recently employed about 5,000 staff, was bought last year by Modella Capital, the private equity firm which is also behind Hobbycraft and owned the UK arm of jewellery retailer Claire’s and The Original Factory Shop until they collapsed earlier this year.

It recently bought Flying Tiger, the Danish retailer known for its cut-price homewares, craft kits and notebooks, which operates about 1,000 stores worldwide.

TG Jones in Oxford (Image: Google Maps)

The original owner of WH Smith continues to operate stores in airports, hospitals and railway stations, so Modella quickly rebranded the high street stores as TG Jones.

Sales quickly fell back after the deal, and Modella had warned it could have to call in administrators if the restructuring plan, which involves writing off debts to suppliers and cutting rent for many landlords, was not approved.

The judge approved the plan despite his scepticism about potential success, because Modella had put up new investment to turn it around.

Alex Willson, the chief executive of TG Jones, said last month that approval of the plan “allows us to move ahead with our turnaround strategy”.

“The plan protects the substantial core of the store estate and makes TG Jones a stronger, more sustainable business,” he said.

Court approval was needed for what is known as a “cram down” scheme, as many classes of creditor who would lose money under the scheme rejected it. The model allows courts, in certain circumstances, to impose a restructuring on dissenting classes of creditors.

Fewer than a third of general creditors, who include card makers and pen brands, agreed to the plan and no landlords owning unwanted stores – where rent will be cut to zero or closed – backed the plan.

Small suppliers, such as toy makers, were set to lose at least half the money owed to them by the former WH Smith high street chain under the restructure.





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B&Q issues urgent recall for popular heatwave item amid 'electric shock' warning

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B&Q has issued an urgent recall for one of its popular heatwave items after warning of ‘electric shock and fire’.



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