Hidden Prompt Injection in Brazilian Labor-Court Petition Reportedly Tried to Manipulate Galileu

Galileu, an AI tool used by Brazil's labor courts, reportedly detected hidden instructions embedded in an initial petition before the 3rd Labor Court of Parauapebas. The text allegedly told the AI to contest the petition superficially and not challenge documents. Galileu reportedly alerted the judge and blocked the hidden content from processing; the judge then reviewed the material before imposing any procedural consequences.

What this means for youFor courts and the public, this shows that documents sent to AI tools can hide instructions meant to steer them. Courts and agencies using AI should screen inputs and keep a human reviewer in the loop. Ordinary people and businesses using AI to read documents should not assume the AI's output is untampered and should check anything important themselves.