--- title: Agentic AI and Security | daily.dev description: Agentic AI systems face a fundamental security flaw: LLMs cannot distinguish instructions from data, making them vulnerable to prompt injection attacks. The... canonical: https://daily.dev/posts/agentic-ai-and-security-zqrngwfxj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Agentic AI and Security | daily.dev og:description: Agentic AI systems face a fundamental security flaw: LLMs cannot distinguish instructions from data, making them vulnerable to prompt injection attacks. The... og:url: https://daily.dev/posts/agentic-ai-and-security-zqrngwfxj og:image: https://api.daily.dev/og/posts/zqrngwfxj.png og:image:alt: Agentic AI and Security og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Agentic AI and Security **[Martin Fowler](https://daily.dev/sources/mafo)** · 23 min read · 40 upvotes · 3 comments ## Summary Agentic AI systems face a fundamental security flaw: LLMs cannot distinguish instructions from data, making them vulnerable to prompt injection attacks. The "Lethal Trifecta" occurs when an LLM has access to sensitive data, untrusted content, and external communication simultaneously, enabling attackers to exfiltrate information through hidden instructions. Mitigations include minimizing each trifecta element, running LLMs in isolated containers, splitting tasks into smaller controlled steps, maintaining human oversight at every stage, and following the principle of least privilege. Despite vendor efforts, no fully secure agentic AI systems exist yet. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@fulyacimendere** · 0 upvotes > great article! That is worth of every minute **@capestart** · 0 upvotes > very interesting read. the concept of the lethal trifecta makes things look in perspective. ## Similar posts on daily.dev - [The Lethal Trifecta: Why Your AI Agent Could Be a Security Liability](https://daily.dev/posts/the-lethal-trifecta-why-your-ai-agent-could-be-a-security-liability-4nfnrjhax) · Snowflake Community · 1 upvotes · 0 comments - [Agents are rewriting the rules of security. Here’s what engineering needs to know.](https://daily.dev/posts/agents-are-rewriting-the-rules-of-security-here-s-what-engineering-needs-to-know--khtu9taim) · The New Stack · 0 upvotes · 0 comments - [Schneier on Security](https://daily.dev/posts/schneier-on-security-gxau15bc5) · Schneier on Security · 0 upvotes · 0 comments - [Schneier on LLM vulnerabilities, agentic AI, and “trusting trust”](https://daily.dev/posts/schneier-on-llm-vulnerabilities-agentic-ai-and-trusting-trust--fkhqbqfs0) · Sutter's Mill · 1 upvotes · 0 comments --- Tags: [#ai](https://daily.dev/tags/ai), [#security](https://daily.dev/tags/security), [#docker](https://daily.dev/tags/docker), [#llm](https://daily.dev/tags/llm), [#prompt-injection](https://daily.dev/tags/prompt-injection) [View this post on daily.dev](https://daily.dev/posts/agentic-ai-and-security-zqrngwfxj) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Agentic AI and Security","url":"https://daily.dev/posts/agentic-ai-and-security-zqrngwfxj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/agentic-ai-and-security-zqrngwfxj"},"datePublished":"2025-10-28T13:22:49.034Z","dateModified":"2025-10-28T13:23:11.085Z","description":"Agentic AI systems face a fundamental security flaw: LLMs cannot distinguish instructions from data, making them vulnerable to prompt injection attacks. The...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/1c295a3a6ab4458635efdadec66c051c?_a=AQAEulh","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/1c295a3a6ab4458635efdadec66c051c?_a=AQAEulh","isAccessibleForFree":true,"articleSection":"Martin Fowler","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Martin Fowler","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/mafo","url":"https://daily.dev/sources/mafo"},"commentCount":3,"discussionUrl":"https://daily.dev/posts/agentic-ai-and-security-zqrngwfxj","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":40},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":3}],"keywords":"ai,security,docker,llm,prompt-injection","timeRequired":"PT23M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Martin Fowler","item":"https://daily.dev/sources/mafo"},{"@type":"ListItem","position":3,"name":"Agentic AI and Security"}]} {"@context":"https://schema.org","@type":"WebPage","@id":"https://daily.dev/posts/agentic-ai-and-security-zqrngwfxj","comment":[{"@type":"Comment","text":"great article! That is worth of every minute","datePublished":"2025-11-14T17:44:56.403Z","url":"https://daily.dev/posts/zqrngwfxj#c-Uqljkl6Pc","author":{"@type":"Person","name":"FCimendere","url":"https://daily.dev/fulyacimendere","image":"https://media.daily.dev/image/upload/s--6UKZ5-hG--/f_auto/v1722414356/avatars/avatar_qmVXKAXfYtGk4ZT4uOPL2"}},{"@type":"Comment","text":"very interesting read. the concept of the lethal trifecta makes things look in perspective.","datePublished":"2025-11-05T09:23:12.108Z","url":"https://daily.dev/posts/zqrngwfxj#c-01hXzfi6h","author":{"@type":"Person","name":"CapeStart","url":"https://daily.dev/capestart","image":"https://media.daily.dev/image/upload/s--whj108mU--/f_auto/v1758187812/avatars/avatar_Pcn9ylzyt9IhD4SoHHPHt?_a=BAMAK+ZW0"}}]} ```