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The PHP project released patches Wednesday for two critical vulnerabilities in a programming language used in an extremely large portion of the internet.
The patch addresses two flaws, catalogued as CVE-2026-109618 and CVE-2026-109619, both rated 9.2 on the CVSS v4.0 severity scale, which tops out at 10. Researchers describe them as remote code execution vulnerabilities, which could let an attacker run their own code on a server and potentially take control of it.Β
The vulnerabilities have been dubbed βphp2shellβ by researchers. While the industry has spent the past 24 hours sounding the alarm over the vulnerabilities, there has been very little in terms of reported exploitation as of Wednesday afternoon.
In a release, the Cybersecurity and Infrastructure Security Agency said it wasnβt aware of any exploitation.
βWhile CISA has not observed exploitation of these vulnerabilities as of the time of publication, they pose a risk to organizations if left unpatched,β the release reads.
Multiple researchers have told CyberScoop that they have observed very little activity outside of reconnaissance that is probing to see what vulnerable systems are still connected to the internet.
βWe see clear evidence attackers are actively probing and performing reconnaissance across PHP applications,β Kelly Shortridge, chief product officer at Fastly, told CyberScoop. βThe gap between disclosure and widespread, repeatable exploitation is typically hours to a few days for vulnerabilities of this severity and attack ROI.β
βWe have not observed, or independently confirmed, successful in-the-wild exploitation of these vulnerabilities on live customer systems,β Jon Semon, principal security operations analyst at Huntress, told CyberScoop.
βWe have checked across the Linux web servers we have visibility into for the post-exploitation behavior shown in the public proof of concept, such as a web server process spawning a shell that runs recon commands or writes a file into the web root, and did not find activity matching it.β
Neither the technical cause nor a complete list of affected versions has been officially confirmed, with the PHP team saying full details will be published with the release. An advisory from CERT-EU, the European Unionβs computer emergency response team, says the flaws could affect every version of PHP from 5 onward.Β
The security firm watchTowr said Tuesday the vulnerabilities had been set for release Thursday under embargo. The PHP team moved the release up a day and said it could act sooner still if details became public or exploitation appeared.
A video demonstrating an exploit chain spread online overnight via researcher Kirill Firsov, who shared it and credited researchers known as LCFR and Calif.io. watchTowr said it had reproduced one of the flaws. Code claiming to exploit the flaws is circulating but has not been verified, and security firms caution such code is sometimes laced with malware.
The potential exposure is broad. PHP runs between 70-80% of websites whose server-side language is known, according to market research, and underpins platforms including WordPress, Drupal, Joomla and Laravel. Researchers estimated more than 1.3 million internet-exposed hosts could be vulnerable, and a Shodan search counted about 1.9 million. Among servers that disclose their version, most run branches are no longer receiving security updates: about 758,000 run versions from 5.4 through 8.1, compared with 272,000 on supported branches, according to VirusTotal.
CERT-EU and Britainβs National Cyber Security Centre advised organizations to prepare to update systems quickly and suggested isolating internet-facing applications where immediate patching was not feasible. PHP flaws have been exploited before: the U.S. Cybersecurity and Infrastructure Security Agencyβs known-exploited vulnerability catalog lists three in PHP itself, two used in ransomware campaigns.
The vulnerability was discovered by AI cybersecurity firm Calif, using OpenAIβs cybersecurity-focused AI model GPT-5.6 Sol. Wiz, an AI security firm purchased by Google in March, also independently discovered and reported the flaw, according to a blog posted by OpenAI on Wednesday.
The discovery sparked a two-month collaborative effort between OpenAI, PHP maintainers, researchers and security providers to develop a long-term technical fix and prepare for public disclosure.
OpenAI said the priority for all organizations relying on PHP is to apply the new patches, and offered a free tool and other support to help identify vulnerable versions.
βTo our knowledge, frontier AI found these vulnerabilities before attackers did, opening a Defenderβs Window for maintainers and security providers to prepare fixes and protections ahead of disclosure,β OpenAI wrote in an unsigned blog.
OpenAI also said the PHP flaw is among βseveral significant vulnerabilities weβve already found and are working to fix, and we expect similar findings to increase sharply in the coming months.β
In a blog posted the same day, researchers at Wiz said they had discovered βmultiple critical vulnerabilitiesβ in PHP, all related to memory safety using GPT-5.6 Sol, their own Wiz Atlas AI tool and Googleβs Gemini 4 Argon to conduct their research.
Perhaps most concerning: The bug existed for decades prior to the emergence of modern AI tools, but itβs so complex and technically arduous that few attackers were likely capable of exploiting it.
According to Wiz, it required developing exploits for βnotoriously complexβ memory bugs that work across different PHP versions, configurations and application behaviors. It would also have to account for differences in PHP deployments that could render the exploit harmless, and each change would require more testing, analysis and debugging.
In the era of AI hacking, βthis is no longer a barrier,β the Wiz researchers said.
Large language models can adapt exploits to different PHP versions, configurations or memory layouts, use third-party testing and debugging tools, and carry out a series of other functions for βreducing the specialist effort required for each target.β
βThis changes the economics of both discovery and exploitation,β wrote Wiz researchers Sagi Tzadik, Shir Tamari, Nir Ohfeld and Tomer Schwartz. βAs AI reduces the effort needed to develop and adapt complex exploits, vulnerabilities that once seemed impractical to exploit become viable targets.β
More information is expected over the course of the day. The PHP team is to publish the full advisory with the release, and security firms including Huntress and Tenable said they would update their analyses as technical details and proof-of-concept code emerge.
UPDATE: 10/21/2026, 3:00 p.m. ET: This article was updated to include infromation from CISA and from industry researchers.
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Russian state-sponsored hackers are breaking into critical infrastructure around the world by exploiting poorly configured and vulnerable networking devices, authorities from the United States and 12 additional countries said in a joint cybersecurity advisory Monday.
Officials once again urged defenders to take more preventative measures to thwart attacks from the Russian Federal Security Service Center 16, which has been actively targeting critical infrastructure for more than a decade. The hackers are also tracked as Berserk Bear, Energetic Bear, Crouching Yeti, Dragonfly, Ghost Blizzard and Static Tundra.
βThis is an ongoing issue that has impacted various U.S. and foreign networks across multiple sectors, including the defense industrial base, communications, energy, financial services, government facilities and health care sectors,β the National Security Agency said in a statement.
The state-sponsored attackers scan the internet for vulnerable routers using default or weak passwords, and have also exploited vulnerabilities in Cisco devices, Ciscoβs Smart Install feature and web portals to take over network devices.Β
Two of the Cisco vulnerabilities exploited by the Russian FSB Center 16 hackers are quite old, includingΒ CVE-2008-4128 and CVE-2018-0171.Β
Officials shared technical details of the threat groupβs activities and advised network defenders to disable Cisco Smart Install on all devices, use stronger modes of authentication and passwords, monitor for unusual credentials and logins using local accounts.Β
The joint advisory comes nearly a year after the FBI issued a similar alert about the same group targeting end-of-life networking devices running Cisco Smart Install.Β
On Monday, the European Union blamed Russiaβs FSB Center 16 for a December 2025 attack on Polandβs energy grid. The United Kingdom, also on Monday, sanctioned 24 individuals and entities allegedly involved in various attacks attributed to Russian intelligence services.
βFrom directing criminals toβ―targeting businesses, and striking Polandβs energy grid inβ―the depths of winter, theβ―Russian stateβ―is sinking to newβ―lowsβ―in its attemptsβ―toβ―undermine European security,β Yvette Cooper, foreign security of the United Kingdom, said in a statement.Β
Other countries behind the joint cybersecurity advisory include: Canada, Australia, New Zealand, Czech Republic, Denmark, Estonia, Finland, France, Italy, Poland and Sweden.
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