A critical zero-click vulnerability known as “ShadowLeak” was recently discovered in OpenAI’s ChatGPT Deep Research agent, exposing users’ sensitive data to stealthy attacks without any interaction required.
Uncovered by Radware researchers and disclosed in September 2025, the vulnerability specifically targeted the Deep Research agent’s integration with applications like Gmail. This feature, launched by OpenAI in February 2025, allows the agent to autonomously browse, analyze, and synthesize large amounts of online and personal data to produce detailed reports.
The ShadowLeak exploit works through a technique called indirect prompt injection, where an attacker embeds hidden commands in an HTML-formatted email—such as white-on-white text or tiny fonts—that are invisible to the human eye.
When the Deep Research agent reads the booby-trapped email in the course of fulfilling a standard user request (like “summarize my inbox”), it executes those hidden commands. Sensitive Gmail data, including personal or organizational details, is then exfiltrated directly from OpenAI’s cloud servers to a
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