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Prompt EngineeringKevin Liu / Microsoft BingMicrosoft

Prompt injection leaks Bing Chat's codename Sydney and its system instructions

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Prompt injection leaked Bing Chat's internal codename Sydney and its system instructions

Why it matters

Publicly demonstrated that in a live service the system prompt does not work as a line of defense

Source — Primary sources first; secondary reports are labelled “Press”

Pressmspoweruser.comhttps://mspoweruser.com/chatgpt-powered-bing-discloses-original-directives-after-prompt-injection-attack-latest-microsoft-news/

Added in Week 35, 2026 · See that week

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