https://github.com/OWASP/www-project-top-10-for-large-langua...
In the citations:
14. Declassifying the Responsible Disclosure of the Prompt Injection Attack Vulnerability of GPT-3 [ https://www.preamble.com/prompt-injection-a-critical-vulnera... ]: Preamble; earliest disclosure of Prompt Injection
If so then 4chan had prior art, discovering prompt injections when they made Microsoft's Tay chatbot become a racist on twitter.