{"id":4378,"date":"2026-04-24T11:23:26","date_gmt":"2026-04-24T07:53:26","guid":{"rendered":"https:\/\/vanak.news\/?p=4378"},"modified":"2026-04-24T11:23:26","modified_gmt":"2026-04-24T07:53:26","slug":"anthropic-investigates-claims-of-unauthorized-access-to-mythos-ai-tool","status":"publish","type":"post","link":"https:\/\/vanak.news\/?p=4378&lang=en","title":{"rendered":"Anthropic Investigates Claims of Unauthorized Access to Mythos AI Tool"},"content":{"rendered":"<p><b>Anthropic is investigating a claim that a small group of people gained access to its Claude Mythos model<\/b> \u2013 the cyber-security tool which the AI firm says is too powerful to release to the public.<br \/>\n&#8220;We&#8217;re investigating a report claiming unauthorized access to Claude Mythos Preview through one of our third-party vendor environments,&#8221; the company said in a statement.<br \/>\nIt was in response to a Bloomberg report that users in a private forum managed to access the model without the normal permissions.<br \/>\nThere is deep unease about Mythos&#8217; capabilities \u2013 though the UK&#8217;s top cyber official has said advanced AI tools could be a &#8220;net positive&#8221; if the technology was secured from misuse.<br \/>\nThere is currently no suggestion that malicious actors have managed to get hold of the model, and Anthropic says it does not have evidence its systems are affected.<\/p>\n<h3>Concerns Over AI Model Security<\/h3>\n<p>But the report of access by unauthorised users raises questions about the ability of large AI companies to stop their advanced AI models from getting into the wrong hands.<br \/>\nThis was &#8220;most likely through misuse of access rather than a classic hack,&#8221; according to Raluca Saceanu, chief executive of cyber-security company Smarttech247.<br \/>\nAnthropic has released the Mythos model to some tech and financial companies in order to help them secure their systems against its reported ability to exploit vulnerabilities.<br \/>\nBut that relies on those companies making sure their own access is tightly controlled.<br \/>\nThe person already had permission to view Anthropic&#8217;s AI models through work they had done for a third-party contractor, according to Bloomberg.<br \/>\nThe outlet also reported the group has been using the model since it gained access \u2013 although not for hacking, because they do not want to be detected.<br \/>\n&#8220;When powerful AI tools are accessed or used outside their intended controls, the risk is not just a security incident but the spread of capabilities that could be used for fraud, cyber abuse, or other malicious activity,&#8221; Saceanu said.<\/p>\n<h3>AI&#8217;s Role in Cybersecurity<\/h3>\n<p>In a speech to a large cyber-security conference on Wednesday, the head of the UK&#8217;s National Cyber Security Centre (NCSC) made a more positive case arguing AI tools can make things safer and more secure.<br \/>\nRichard Horne urged the CyberUK delegates not to fear new AI attacks, but to make sure they are doing the basics of cyber-security right.<br \/>\n&#8220;As we have seen in the media in recent days, <b>frontier AI is rapidly enabling discovery and exploitation of existing vulnerabilities at scale<\/b>, illustrating how quickly it will expose where fundamentals of cyber-security are still to be addressed,&#8221; he said.<br \/>\nHorne&#8217;s warnings echo similar messages from recent years \u2013 for example the urgency for people to ensure they update the software on their systems and upgrade legacy IT.<br \/>\nAt the same event, Security Minister Dan Jarvis implored AI firms to work with the government on the &#8220;generational endeavour&#8221; to make sure AI is used to protect critical networks from attackers.<br \/>\nAll the most powerful and advanced AI models \u2013 known as frontier AI \u2013 are developed outside of the UK, with the top-tier companies based in the US or China.<br \/>\nThat means the UK relies on companies like Anthropic to give it access to Mythos and has no control over how it is built, trained or released.<br \/>\nOpenAI also has a cyber-security model it says is very capable called GPT 5.4 Cyber.<br \/>\nThe speeches at CyberUK also pressed home the ongoing threat of nation state and hacktivist attacks, particularly from Russia and China.<br \/>\nThe NCSC warns that cyber is now &#8220;the home front&#8221; of defence in the UK with recent events such as the <b>Iran attacks showing that cyber plays an increasingly important role in all modern conflicts<\/b>.<br \/>\n#Anthropic #MythosAI #Cybersecurity #AIsecurity #UnauthorizedAccess #ClaudeMythos #FrontierAI #TechNews #DataProtection #CyberThreats<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Anthropic is investigating a claim that a small group of people gained access to its Claude Mythos model \u2013 the cyber-security tool which the AI firm says is too powerful to release to the public. &#8220;We&#8217;re investigating a report claiming unauthorized access to Claude Mythos Preview through one of our third-party vendor environments,&#8221; the company [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4379,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[38],"tags":[],"class_list":["post-4378","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-world-news"],"_links":{"self":[{"href":"https:\/\/vanak.news\/index.php?rest_route=\/wp\/v2\/posts\/4378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vanak.news\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vanak.news\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vanak.news\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/vanak.news\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4378"}],"version-history":[{"count":0,"href":"https:\/\/vanak.news\/index.php?rest_route=\/wp\/v2\/posts\/4378\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vanak.news\/index.php?rest_route=\/wp\/v2\/media\/4379"}],"wp:attachment":[{"href":"https:\/\/vanak.news\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vanak.news\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vanak.news\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}