--- title: "The Mythos moment: Why agentic AI changes cybersecurity, but not in the way many think" description: Anthropic’s announcement of Claude Mythos Preview may end up being remembered as the moment the cybersecurity industry had to stop talking about agentic AI as a future concept and start treating it as a present security variable. canonical_url: https://www.acronis.com/en/blog/posts/the-mythos-moment-why-agentic-ai-changes-cybersecurity-but-not-in-the-way-many-think/ locale: en last_updated: 2026-10-27 --- [Acronis Blog](https://www.acronis.com/en/blog/) # The Mythos moment: Why agentic AI changes cybersecurity, but not in the way many think Anthropic’s announcement of Claude Mythos Preview may end up being remembered as the moment the cybersecurity industry had to stop talking about agentic AI as a future concept and start treating it as a present security variable. [Try Now](https://www.acronis.com/en/products/cloud/trial/) [![Image 2: Jan-Jaap Jager](https://staticfiles.acronis.com/images/content/f9dc71b2d73f68588de9a5ec72cb042a.png)](https://www.acronis.com/en/blog/authors/jan-jaap-jager/ "Jan-Jaap Jager") [Jan-Jaap Jager,](https://www.acronis.com/en/blog/authors/jan-jaap-jager/)CEO 5 min read Last updated 09 June 2026 Anthropic’s announcement of Claude Mythos Preview may end up being remembered as the moment the cybersecurity industry had to stop talking about [agentic AI](https://www.acronis.com/en/blog/posts/safe-agentic-ai-for-msps-and-smds-guardrails-tenant-isolation-access-control-human-approval/) as a future concept and start treating it as a present security variable. The reported results are serious. Anthropic says [Mythos Preview identified and exploited zero-day vulnerabilities](https://red.anthropic.com/2026/mythos-preview/) across major operating systems and browsers during testing. Its technical write-up reported 181 working Firefox exploits in one benchmark, plus 10 full control-flow hijacks on fully patched OSS-Fuzz targets. The [U.K. AI Security Institute reached a similar conclusion](https://www.aisi.gov.uk/blog/our-evaluation-of-claude-mythos-previews-cyber-capabilities) in its independent evaluation, calling Mythos “a step up over prior frontier models” and reporting a 73% success rate on expert-level capture-the-flag tasks, along with three full completions out of 10 runs in a 32-step end-to-end attack simulation. Only weeks after the Mythos announcement, an anonymous group of Discord users claimed it [obtained unauthorized access to Mythos](https://www.bbc.com/news/articles/cy41zejp9pko) by guessing its location. Anthropic is currently investigating this claim. Although, w e should take all of this seriously, we should also be careful not to confuse a meaningful capability shift with an instant collapse of defensive reality. This does not mean AI has suddenly become an autonomous super-hacker that will immediately defeat every mature enterprise. The better way to understand what is happening is the one the [U.K. National Cyber Security Centre has already outlined](https://www.ncsc.gov.uk/report/impact-ai-cyber-threat-now-2027): AI is accelerating and enhancing existing attacker tradecraft. It is improving reconnaissance, vulnerability research, exploit development, social engineering, malware generation and data processing. In other words, it is making offensive operations faster, denser and more scalable. That is a major shift, but it is not magic. That distinction matters, because much of the Mythos conversation has already split into two extremes that are equally unhelpful. One side treats it as proof that offensive AI will make conventional cyber defense obsolete. The other dismisses it as little more than frontier-model marketing theater. I think both reactions miss the point. The real change is not that AI suddenly replaces attackers or defenders. The real change is that agentic systems compress time. They shorten the interval between finding weakness and exploiting weakness. They help attackers adapt attack paths more quickly to the software mix, patch level, privilege structure and operational habits of a target environment. They increase the odds that pressure lands exactly where most organizations are still fragile: the delayed patch, the unmanaged endpoint, the exposed identity, the misconfigured cloud workload and the recovery workflow nobody has tested in months. [![Image 3: Acronis GenAI Protection is now live: Secure the AI era](https://staticfiles.acronis.com/images/content/eec37275aced5f0ce36055592787333b.png) Acronis GenAI Protection Acronis GenAI Protection is now live: Secure the AI era Try now](https://www.acronis.com/en/products/cloud/cyber-protect/genai-protection/) That is why this matters far beyond large banks or critical infrastructure. The same dynamic applies to health care, manufacturing, logistics, SaaS, retail, education and managed service providers (MSPs). Any organization that depends on uptime, trustworthy data and software-mediated operations now must assume that the attacker’s learning loop is getting faster. We are also seeing the problem expand beyond model capability itself. The broader AI toolchain is becoming part of the attack surface. [Recent reporting around the Vercel breach](https://thehackernews.com/2026/04/vercel-breach-tied-to-context-ai-hack.html), tied to a compromised third-party AI tool and a Google Workspace OAuth path, is a reminder that the risk is no longer confined to code and infrastructure in the traditional sense. Organizations now must think about agents, connectors, AI services, permissions and data flows that sit between humans and production systems. That is why, in my view, the right response is not “more AI” in the abstract. The right response is disciplined cyber resilience. If agentic systems compress the offense cycle, defenders need to compress the control cycle. That starts with exposure reduction: continuous inventory, faster patching, tighter hardening, less software drift, fewer unmanaged systems, stronger identity boundaries and better-tested recovery paths. It continues with detection and response, because the SOC itself is becoming more agentic. That can be a real advantage, but only if it is grounded in operational discipline and human oversight. At Acronis, this is exactly how we think about the problem. We do not see the answer as a single AI feature or a claim about autonomous defense. We see the answer as an integrated cyber resilience model that helps organizations reduce exposure, detect faster, respond with more context and recover when prevention fails. That is also why [Acronis GenAI Protection](https://www.acronis.com/en/products/cloud/cyber-protect/genai-protection/) matters. One of the biggest shifts in this new environment is that AI is not just something attackers use. It is also something employees use every day, often before governance and policy have fully caught up. That creates a different class of risk: prompt-driven data leakage, unsanctioned use of AI tools and the quiet movement of sensitive or regulated information into external services. We believe organizations need visibility and control here — not just policy documents. They need to know which AI applications are being used, where the risk is real and how to enforce guardrails without slowing the business to a halt. The same principle applies further down the stack. If attacks are going to move faster across endpoints, identities, collaboration systems, email, and cloud environments, then isolated visibility is no longer enough. This is why [EDR](https://www.acronis.com/en/products/cloud/cyber-protect/security-edr/) and [XDR](https://www.acronis.com/en/products/cloud/cyber-protect/extended-detection-and-response/) matter more in an agentic era — not less. Security teams need the ability to see attacks in context, connect signals across environments, prioritize the incidents that matter, and respond before a fast-moving intrusion becomes a business disruption. For many organizations, especially MSPs and SMBs, that is easier said than done. They may understand the threat perfectly well and still lack the staff, time or operational maturity to run a 24/7 security program internally. That is where [MDR](https://www.acronis.com/en/products/cloud/cyber-protect/managed-detection-and-response/) becomes critical. The gap between the speed of modern attacks and the capacity of lean teams is only getting wider. Security outcomes increasingly depend not on whether organizations can buy another tool, but whether they can extend their operational reach. This is also why I believe resilience must be broader than cybersecurity in the narrow sense. In an AI-driven threat environment, prevention, detection, response, data protection, posture management, email security and recovery all belong in the same strategic conversation. AI-assisted attacks do not respect category boundaries. The initial compromise may start in email. The escalation may depend on identity misuse or configuration drift. The lateral movement may happen through collaboration tools or cloud apps. The real business impact may depend on whether recovery works when everything else has already gone wrong. At the same time, defenders should resist the temptation to assume agentic AI will solve its own problems. Large language models remain probabilistic systems. They are powerful accelerators for search, synthesis, coding and planning, but they are not inherently reliable judges of truth. Hallucinations, inconsistency and brittle reasoning under uncertainty are not side issues. They are structural realities that must be designed around. That does not make agentic AI less useful. It makes verification, guardrails, testing and human accountability nonnegotiable. My view is simple. Mythos matters, but not because it proves machines have already won the cyber race. It matters because it removes any remaining excuse to treat AI as a side topic in security. Agentic AI is now part of the operating environment. It will strengthen both offense and defense. It will create real productivity gains and real operational risk. And it will reward the organizations that are disciplined enough to do two things at once: move faster and verify more. At Acronis, we believe that is the real challenge of this moment. Not whether AI changes cybersecurity. It already has. The real question is whether organizations will respond with hype or with resilience. [![Image 4: Acronis GenAI Protection is now live: Secure the AI era](https://staticfiles.acronis.com/images/content/eec37275aced5f0ce36055592787333b.png) Acronis GenAI Protection Acronis GenAI Protection is now live: Secure the AI era Try now](https://www.acronis.com/en/products/cloud/cyber-protect/genai-protection/) [Cybersecurity](https://www.acronis.com/en/blog/tags/cybersecurity/) [Cyber protection](https://www.acronis.com/en/blog/tags/cyber-protection/) [Cyberthreats](https://www.acronis.com/en/blog/tags/cyberthreats/) [Data protection](https://www.acronis.com/en/blog/tags/data-protection/) ## Written by ![Image 5: Jan-Jaap Jager](https://staticfiles.acronis.com/images/content/f9dc71b2d73f68588de9a5ec72cb042a.png) Jan-Jaap Jager CEO Jan-Jaap (JJ) Jager is the Chief Executive Officer. JJ joined Acronis in 2014 to develop emerging markets. After that, he launched the Cloud business at Acronis, served as Chief Revenue Officer and Board Advisor. Before returning to Acronis as a CEO, JJ served as President and Chief Operating Officer of Virtuozzo and Chief Executive Officer of Chainstack. JJ brings the wealth of experience as a serial entrepreneur, seasoned executive and investor in the technology market. [Previous post](https://www.acronis.com/en/blog/posts/acronis-cyber-protect-cloud-certified-in-av-test-advanced-threat-protection-for-windows/) [Acronis Cyber Platform certified in AV-TEST Advanced Threat Protection for Windows](https://www.acronis.com/en/blog/posts/acronis-cyber-protect-cloud-certified-in-av-test-advanced-threat-protection-for-windows/) [Next post](https://www.acronis.com/en/blog/posts/manufacturing-cybersecurity/) [Manufacturing cybersecurity: An MSP guide to protecting IT, OT and uptime](https://www.acronis.com/en/blog/posts/manufacturing-cybersecurity/) About Acronis Acronis is a leader in AI-native cyber protection, unifying data protection, cybersecurity, IT operations and hybrid infrastructure to deliver business continuity, security and compliance with less cost and complexity. More than 21,000 service providers trust Acronis to protect over 750,000 businesses in 150 countries. Acronis is headquartered in Schaffhausen, Switzerland. [Add as a preferred source on Google](https://google.com/preferences/source?q=acronis.com) ## Related stories Want to learn more? Read the latest stories featuring this solution on our blog. [Acronis Blog](https://www.acronis.com/en/blog/) ![Image 6: Introducing New Acronis CEO: Prakash Panjwani](https://staticfiles.acronis.com/images/blog-card/30cb571f6f1aaa131733e5727a4a250c.png) [Introducing New Acronis CEO: Prakash Panjwani](https://www.acronis.com/en/blog/posts/introducing-new-acronis-ceo-prakash-panjwani/) We are pleased to announce the appointment of our new Chief Executive Officer, Prakash Panjwani. A veteran cybersecurity CEO, Panjwani previously served as CEO of WatchGuard Technologies and SafeNet. **October 15, 2026**2 min read ![Image 7: Microsoft AI Security for SMBs: Purview Coverage Explained](https://staticfiles.acronis.com/images/blog-card/26d37ae6d05d5d57f26427da530711de.png) [Microsoft AI Security for SMBs: Purview Coverage Explained](https://www.acronis.com/en/blog/posts/microsoft-ai-security-for-small-teams/) See what Microsoft Purview covers for AI security, where additional controls may help, and how Acronis GenAI Protection supports SMBs and MSPs. **September 30, 2026**9 min read ![Image 8: AI data security: protecting sensitive information across AI tools](https://staticfiles.acronis.com/images/blog-card/4018bfcee2b5b2b8fac70b143c616e02.png) [AI data security: protecting sensitive information across AI tools](https://www.acronis.com/en/blog/posts/ai-data-security-protecting-sensitive-information-across-ai-tools/) Learn how SMBs can protect sensitive data in AI prompts, pasted text and file uploads, and how these controls differ from AI security posture management. **September 28, 2026**9 min read