The ChatGPT macOS app had a security issue where conversations were stored in plain text, making it easy for bad actors or malicious apps with access to the machine to read the conversations and the data contained within them5. This issue has since been resolved with an update that encrypts the chats.
Pedro José Pereira Vieito demonstrated the security flaw by creating an app that could easily access and display ChatGPT conversations in plain text. He shared the app with Jay Peters, who used it to make a video showing how the app could read ChatGPT conversations with a simple click, highlighting the vulnerability of the stored data.
After being contacted by The Verge, OpenAI released an update for its ChatGPT macOS app that encrypts the chats, addressing a security issue where chats were stored on the computer and could be read in plain text.