The exposure was immense, with AI multiplying the risks — and yet time-tested global cybersecurity procedures appeared to be functioning. Then suddenly, it all broke down.        

The decision by a cybersecurity company on Wednesday to prematurely release information about a flaw in the popular PHP computer programming language left much of the web exposed to hackers, triggering a panic that brought to life months of warnings of how the AI-powered era could cause widespread damage.

The flaws in PHP, discovered using AI tools through a months-long process coordinated by OpenAI, caused cyber agencies across Europe, the U.S., the U.K., Australia and Canada to post urgent warnings Wednesday. Numerous governments took websites offline as a precaution.

While no major hacking damage was immediately apparent, the way the incident unfolded over 72 hours showed how easily cybersecurity processes can break down and the outsized consequences of cyber risks in the AI era.

The man who set off the chain reaction with the early release — Chainguard’s CEO Dan Lorenc — quickly apologized in a LinkedIn post. But on Thursday, in an interview with POLITICO, Lorenc said he’d shared the information ahead of time because the flaw was already being exploited. Though others disputed that, Lorenc said he believed he’d seen enough evidence to invalidate an embargo set up to allow time to find a fix for the flaws. 

While he disputed that his actions would have caused problems for other defenders, Lorenc conceded that the evidential threshold in these coordinated cyber defense systems is a “grey area.” 

The revelation of the PHP flaw brings out into the open what cyber officials have been bracing for since the arrival of the most powerful tools of artificial intelligence, which not only can be used to discover vulnerabilities but also to exploit them at scale. 

The cybersecurity world’s long-established protocols helped prevent disaster scenarios, in which hackers would have successfully exploited the vulnerabilities to take control of numerous websites and access their data. But now the scale and end-of-days potential of AI-driven cyber risks are visible for the world to see. 

This “is what happens when AI turns up a flaw that’s been hiding for years,” said Eylam Milner, co-founder and chief technology officer at cybersecurity start-up Echo. The vulnerabilities, he added, are “about as serious as it gets for the web.”

Origin story

Understanding how this week’s emergency unfolded offers a glimpse at how companies and authorities are working to stave off attacks — and how much risk they face going forward. 

The origins of the incident can be traced back as far as April when top frontier AI firm Anthropic unveiled Mythos, leading some in the cybersecurity world to worry that systems would quickly be overrun by advanced artificial intelligence, with potential for catastrophic events to ensue.

But while researchers did find more flaws in computer systems in the months after Anthropic and other AI firms like OpenAI released those models, they had little impact in the real world. Even the Hugging Face incident, a widely discussed hack that saw OpenAI’s autonomous AI agents go rogue during an internal security evaluation, related more to the level of control AI companies exert over their models than their power to break into systems worldwide. 

That changed this week after researchers unveiled the vulnerability in PHP, a coding language estimated to be integrated into some 70% of the web.

The process by which information about flaws is released among cybersecurity officials and affiliated companies is crucial. Through a longstanding practice known as coordinated disclosure, researchers and companies that identify flaws can find a fix and share it confidentially with agencies and others before releasing to the public, meaning they don’t hand malicious hackers the gift of a hole without a fix.

In the case of the PHP flaw, that process worked well, but not perfectly. Information about the bugs started to circulate ahead of the planned release time. Then, according to the PHP Foundation, Chainguard “unilaterally broke the embargo,” which “disregarded weeks of work by many parties toward a coordinated disclosure.” PHP Foundation executive director Elizabeth Barron told POLITICO by email that while it was “disappointed” with Chainguard, it hopes to “rebuild trust with them in the future to ensure we can continue to collaborate effectively.”

After the leak— which meant information about the bugs was in the open before the fix was ready — confusion quickly ensued, with government bodies and private companies choosing to temporarily shut down their websites rather than risk potentially damaging breaches to their data and the sites themselves.

Early Thursday, Matthew Prince, the CEO of Cloudflare, an internet services company that is widely used by websites to block cyberattacks, giving it a high level of visibility over what hackers are doing, said in a post on X that it had seen “millions” of attempts to exploit the flaw.

Cloudflare saw thousands in the 10 hours before the flaw was publicly announced, then tens of thousands in the 45 minutes after the announcement, hundreds of thousands within two hours, and now millions, Prince said.

Amazon’s cloud division also said the flaw is “now being broadly exploited in the wild.”

One senior U.S. government cyber official said that federal authorities have been overwhelmed — and not just by PHP. The same day the world was racing to address PHP, they were also dealing with bugs in node.js, a widely used JavaScript framework, Fortinet, GitHub and Oracle.

“The fire department is fighting multiple fires at once,” the official said, adding: “The good news is they’re all one-story structures on fire, which the fire department deals with all day, every day.”

More to come

Dauntingly, OpenAI said there’s more on the way. “These bugs are among several significant vulnerabilities we’ve already found and are working to fix, and we expect similar findings to increase sharply in the coming months,” the company said Wednesday in a statement.

Matthijs van Amelsfort, head of the Dutch cybersecurity agency, said in an interview that the job of keeping computer systems safe has been transformed by the advancement of AI. “As soon as the frontier models came out, that’s exactly what we said, this will be the trend,” he said. “And actually that’s happening now.”

Thomas Caspers, vice president of Germany’s cyber agency BSI, concurred: “We expect that [to be] happening more and more during the coming months.” 

AI also ramps up the risks once the flaws are out in the open. Cyber agencies’ recommendation that organizations take their websites offline was “really a drastic measure,” Caspers said. “We wouldn’t have done that a few years ago or so.” But because AI has made it quicker and easier to exploit flaws, “we had to do that,” he said. 

At the same time, the use of advanced AI to detect the flaws may create a new level of protection against malicious hackers looking to take advantage of them. Caspers said that though his German agency has also seen attacks, it has not seen any successful use of the flaw by hackers.

“It seems a little bit more complicated than expected to exploit,” he said. 

Despite the fact that AI offers a new way to discover flaws, the work involved in keeping systems protected is more quotidian, with cyber agencies urging organizations to install the fix shared by the PHP Foundation, in a process known as patching.

“There are three things that you have to do right now,” said van Amelsfort from the Dutch agency. “And that’s patch, patch, and patch.” 

John Sakellariadis contributed to this report.

The vibe-coding platform said all of its customers should revoke and rotate their private keys, after hackers were able to decrypt some customer secrets.

Cyberattackers have made “millions” of attempts to take advantage of a critical hole in a building block of the internet, a key cybersecurity provider said early Thursday.

Two top European cyber officials later told POLITICO that hackers have so far struggled to exploit the vulnerability.

Cybersecurity agencies worldwide continue to scramble to respond to the public revelation Wednesday of a flaw in PHP, a foundational computer programming language used to underpin 70% of the internet. 

Matthew Prince, the CEO of Cloudflare, an internet services company that is widely used by websites to block cyberattacks — giving it a high level of visibility over what hackers are doing — said in a post on X that it’s seen “millions” of “attempts to exploit” the flaw.

Cloudfare saw thousands in the 10 hours before the flaw was publicly announced, meaning information must have leaked, then tens of thousands in the 45 minutes after the announcement, hundreds of thousands within two hours, and now millions, Prince said.

Amazon’s cloud division also said the flaw is “now being broadly exploited in the wild.”

But Thomas Caspers, vice president of Germany’s cyber agency BSI, said in an interview that though his agency has also seen attacks, it has not seen any successful use of the flaw by hackers. 

“It seems a little bit more complicated than expected to exploit,” he said. “When we had the planning process before the release of the patch, we were expecting a much faster track of the attackers.” 

Caspers is not certain why this is the case at this stage, but said it appears that successfully making use of the flaws is harder than expected. Global cyber officials were part of a process coordinated by OpenAI, to find and fix the flaws. “An ad hoc exploitation seems a little more difficult than expected,” he said.

The challenge for bad actors may also be linked to the major AI providers building guardrails so their tools can’t be used to exploit flaws, he said. When a POLITICO reporter as a test asked ChatGPT and Claude, models from OpenAI and Anthropic respectively, how to exploit the PHP vulnerabilities, both chatbots declined to provide the information. The two companies did not immediately respond to requests for comment. 

Numerous European government departments took their websites offline as a precaution to Wednesday’s developments. As of Thursday morning, key French websites such as the justice ministry and the data protection authority still featured a message they were undergoing maintenance. 

Matthijs van Amelsfort, the head of the Dutch cybersecurity agency, told POLITICO that his agency has no indication that the flaw is “actively being misused” but said that can change, particularly because AI makes it easier to exploit flaws. The agency took its website offline on Wednesday, but it is now back up.

This article has been updated.

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OpenCode is an open source AI coding agent that's become a popular alternative to Claude Code and Cursor. But hackers got into part of its online platform and stole some users’ API keys, and the AI tools it turned to for help kept refusing to look at the malicious code.

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The cyberattack last week that hit hundreds of French supermarket refrigerators had Europeans wondering if the nonstop warnings about AI risks had finally landed in the real world.

They hadn’t — at least, not yet.

Experts say the attack, which forced hundreds of retailers to throw away defrosted food and spoiled milk, was mostly a reminder of the importance of old-school cybersecurity in safeguarding essential goods and services.

The attack is a “typical example” of how “low-key cyber-enabled sabotage can affect very crucial supply for society,” said Ferdinand Gehringer, hybrid threats lead at FTI Consulting. 

It’s arguably the most consequential hack in the European Union this year, with tangible, disruptive real-world repercussions. France’s Prime Minister Sébastien Lecornu personally managed the fallout, which prompted coordination and information-sharing at the EU level. 

The perpetrators, whose identity and motives are currently unknown, hacked into digital systems to remotely raise the temperature of refrigerators in supermarkets including Intermarché and Carrefour.

One cybersecurity expert working with Lecornu’s office said the French government held meetings after the attack to try to map all the potentially affected sectors, beyond supermarkets. “We’re in the middle of the flu vaccination campaign,” he said, referring to vaccine storage, which also relies on temperature control solutions, though no such attacks have been registered.

To add to the fear and confusion, supermarkets in the Netherlands and Belgium experienced unrelated cyber incidents that same week. Though there was limited impact in those cases, they were a good example of “how big our reliance is in the food supply chain on IT and network systems,” Dutch food security minister Silvio Erkens told POLITICO. 

The attacks come after citizens and policymakers have spent months being bombarded with warnings about scenarios in which unpredictable advanced artificial intelligence models escape human control.

While most good and bad actors on the internet are increasingly using AI models to increase speed and capacity, cyber experts say the hackers in question in the French case most likely used traditional methods to take advantage of devices needlessly exposed to the internet.

Connecting devices to the internet in this way is “an old-fashioned bad practice,” said Amir Preminger, chief technology officer at Claroty, a cybersecurity company that identified a software flaw in a product made by Danfoss, one of the refrigeration companies targeted by the French hacks. Danfoss fixed that flaw in 2025. 

Food systems

The attacks come at a time when Europe’s food security is already under considerable pressure due to geopolitical insecurity and climate change. The continuing disruptions in the Strait of Hormuz are pushing up fuel and fertilizer prices at a time where farmers struggle with the fallout of extreme drought that caused lower yields in many parts of Europe. These problems are compounded by the blockade of the Black Sea which is fueling the rise of global food prices.

“It is very serious that cyber criminals attack our food systems,” said Else Groen, director general of trade body Independent Retail Europe. She nonetheless stressed that food supply chains are resilient, which reduces the chances that consumer food supply would be endangered — even if such attacks are already a “major blow” for retailers operating on razor-thin margins.

The incidents bring to the fore a long-running problem with so-called operational technology, meaning industrial devices with physical outputs, like refrigeration systems. Critical sectors are packed with these kinds of devices, many of which are old, poorly protected, unnecessarily connected to the Internet, or some combination of the three. They’re also obscure and sometimes forgotten, despite the ramifications if they’re tampered with.  

And last week’s problems are far from solved. French and German cyber authorities warned that attacks were probably still ongoing, and the Greek cyber agency and an industry tracker said after the attack that there were hundreds of devices still connected to the internet.

Preminger too said there are still devices exposed, though he added that the number is declining, and not all are necessarily vulnerable to attack. Another research group found that the number of exposed Danfoss devices had significantly decreased.

Finding a fix

What’s changed with the widespread diffusion of advanced AI models is that cyber attacks are now faster and easier to replicate. Claroty reproduced the original flaws in Danfoss products in 28 minutes at a cost of $6, it said. 

In broad terms, AI makes it easier to carry out many types of cyberattacks and enables attackers to pounce on software flaws more quickly. Financially motivated cybercriminals — who have already spent years extorting businesses and disrupting essential services like hospitals — can use AI to simultaneously launch attacks on multiple targets.

Though the motive for the attacks on French supermarkets remains unknown, it is notable that there was no reported attempt at extortion. The strike did come as Russia ramps up its campaign of hybrid warfare against Europe, and senior EU and European leaders have consistently warned that Moscow could use cyberattacks to disrupt real-world services. Beyond food supplies, AI-enhanced targeting could be aimed at banking, hospitals and the functioning of the internet itself.

Still, these fears of bad human actors using AI should be distinguished from the science-fiction scenarios pushed by so-called AI doomers, in which bots themselves are motivated and able on their own to wipe out humanity.

Digital security experts, including the EU’s own in-house cyber team, are also turning to AI for defense. But it’s not a silver bullet, said Rémi Enjolras, a chief technology officer at Splunk, part of Cisco. Critical industries need to stop “seeing AI as a magical tool that will solve everything and go back to the fundamentals,” he said.

The EU has passed laws intended to force critical industries and product manufacturers to get those fundamentals right. But France, for example, is lagging in implementing such national regulations, and there are few other incentives to get companies to do that difficult and costly work.

Still, the images of empty supermarket shelves could provide a new incentive. “It should serve as a kind of a wake-up call,” Enjolras said.

Émile Marzolf contributed to this report.

BRUSSELS — The European Commission’s cybersecurity division is rolling out a plan to use artificial intelligence to respond to high-risk cyberattacks, according to a document obtained by POLITICO.

The undated document, written by the Commission’s IT department, sets out how to prepare the EU executive’s cyber defenses for “emerging AI-driven threats.” It proposes an action plan to shore up defenses in light of AI, with the most urgent move being the speed of response to attacks.

Governments have rushed to grapple with the rising threat brought by AI’s ability to expose and exploit cybersecurity vulnerabilities. Incidents like OpenAI’s accidental intrusion into Hugging Face have prompted calls, including at the highest political level, to be more wary of advanced AI models.

Being able to respond quickly to cyberattacks is most crucial in “high-risk scenarios,” the EU executive’s internal cyber defenders warned, saying that the ability to detect an attack is “not sufficient if containment measures cannot be taken quickly enough.”

Officials at the in-house IT department, DG DIGIT, are planning to use automated “protective measures” in specific high-risk scenarios, it said. Those scenarios were redacted in the document, which was provided to POLITICO in response to a freedom of information request.

The plan does not amount to “uncontrolled automation” and there will be strict controls in place including human oversight, according to the document.

As well as laying out the response plan, the document sets out the cybersecurity challenges the Commission faces from AI.

The most advanced AI models are expected to “significantly increase the speed, scale and adaptability of cyberattacks” and the Commission must therefore have defenses in places for an environment where “attacks are likely to become faster, more frequent and more scalable,” it said.

Risks include situations where “malicious activity occurs outside EC [European Commission] normal working hours, spreads more rapidly across systems, or results in large-scale exfiltration or operational disruption before manual intervention can be organized by EC,” they said.

The Commission’s cyber division has sought approval internally to move ahead with the plans, it said, though it’s not clear whether the plans have yet been put in place.

The Commission didn’t respond to a request for comment.