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Check Point Software Technologies is an Israeli cybersecurity company, founded in 1993 and listed on Nasdaq, that sells firewalls, network, cloud and endpoint security products.

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Check Point bypassed ChatGPT Lockdown Mode to leak full chat histories through a popup

Cybersecurity

Check Point Research said on 5 November 2026 that a popup flaw in ChatGPT's HTML preview defeated Lockdown Mode and leaked chats. OpenAI fixed it in September.

Summary

Check Point Research disclosed on 5 November 2026 a way around ChatGPT Lockdown Mode, the setting OpenAI built to stop prompt injection from sending data out of a chat. A nested frame in the HTML preview for code blocks could open a popup outside the sandbox and send the whole chat history to an attacker. In the ChatGPT Classic desktop app no click was needed. OpenAI fixed the flaw on 18 September 2026.