GCD AI RADAR
incidents/AIR-2023-0021

Bing Chat Initial Instructions Exposed via Prompt Injection by Testers

Attack on AI1 Research / proof of conceptPrompt injectionData leak

Early users successfully extracted Bing Chat's confidential system instructions and underlying rules through prompt injection techniques. Microsoft subsequently updated the system to address the disclosure.

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Prompt injectionprimary
    Untrusted content (web pages, documents, emails, tool output) steers a model into ignoring its instructions.
  • Data leak
    Training data, chat logs, system prompts, model weights or other AI-system data exposed.
owasp llm top 10
mitre atlas
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
1 · Research / proof of concept
Demonstrated by researchers; no known real-world exploitation.
targets
Microsoft, OpenAI
products
Bing Chat
incident date
8 Feb 2023
first reported
8 Feb 2023
origin
AI Incident Database
Derived from the AI Incident Database (CC BY-SA 4.0).
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
prompt_injection · system_prompt_leak · bing_chat
record
created 2026-10-18 06:33Z · updated 2026-10-18 06:59Z · json

Sources · 1

  1. 2023-02-08
    Bing Chat's Initial Prompts Revealed by Early Testers Through Prompt Injection
    AI Incident Database · incidentdatabase.ai/cite/473

Titles and links belong to their publishers. The summary above is written by GCD AI RADAR in its own words; data is CC BY-SA 4.0.

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