Agent Data Injection: An arbitrary click attack against web agents
By planting a single fake product review on a shopping page, we made three web agents, Claude for Chrome (Anthropic), Antigravity (Google), and Nanobrowser, click buttons their users never intended. On Claude for Chrome, a request as harmless as "summarize the reviews on this page" ended with a one-click order placed for a product the user never asked for, and it still works on the latest models, including Claude Opus 4.8.


