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, OWASP GenAI Security Project and Microsoft Security Response Center. Sources
Last checked 4 November 2026
8 sources, numbered
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[1] NCSC, 8 December 2025
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[2] OWASP GenAI Security Project
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[3] Microsoft Security Response Center, 29 July 2025
How Microsoft defends against indirect prompt injection attacks
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[4] The Hacker News, 12 June 2025
Zero-Click AI Vulnerability Exposes Microsoft 365 Copilot Data Without User Interaction
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[5] TechCrunch, 22 December 2025
OpenAI says AI browsers may always be vulnerable to prompt injection attacks
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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] NCSC, 27 November 2023
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[8] ETSI
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Prompt injection only shows up when someone tries it against your own tools. Penetration testing can probe the AI features you run or build, to see what a hostile instruction could reach.