How we source this
Sources
Each fact on this site carries a number that links here. We use the statements of the organisations involved, security advisories and established reporting, and check each page again whenever the story moves.
Last reviewed against NCSC (UK), OWASP Gen AI Security Project and UK Government (DSIT). Sources
Last checked 4 November 2026
9 sources, numbered
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[1] NCSC (UK), 8 December 2025
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[2] NCSC (UK), 10 December 2025
Mistaking AI vulnerability could lead to large-scale breaches
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[3] NCSC (UK), 13 February 2024
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[4] OWASP Gen AI Security Project
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[5] UK Government (DSIT), 31 January 2025
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[6] Simon Willison's Weblog, 16 June 2025
The lethal trifecta for AI agents: private data, untrusted content, and external communication
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[7] Cybersecurity Dive, 11 June 2025
Critical flaw in Microsoft Copilot could have allowed zero-click attack
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[8] arXiv, 6 September 2025
EchoLeak: The First Real-World Zero-Click Prompt Injection Exploit in a Production LLM System
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[9] TechCrunch, 22 December 2025
OpenAI says AI browsers may always be vulnerable to prompt injection attacks
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Prompt injection cannot be patched away, so the useful question is how far a manipulated tool could reach. Testing your AI-connected systems the way an attacker would shows where the limits on data and actions need tightening.