Shared ChatGPT link enabled remote account code execution
🛡️ Researchers at Parameter disclosed a flaw in ChatGPT shared links that allowed attacker-supplied code to execute inside the signed-in session of anyone who opened the link. Reported to OpenAI on October 18 and fixed eight days later as a P1 severity, the attack required only opening a shared conversation and, in some variants, clicking the Preview button. The exploit chained a Preview-generated iframe with a vulnerable MathLive listener to inject HTML into the main chat page, letting the attacker call ChatGPT's signed-in APIs and access private conversations. OpenAI patched the issue across web frontends by rejecting the malicious messages; users need not take action. Parameter published details on October 28 and received a $5,000 bounty.