Overview
- The Supreme Federal Court's AI and cybersecurity unit flagged a filing that the court identified on Friday, September 25, as the first recorded attempt to use prompt injection to manipulate judicial processing.
- Investigators found the covert commands on two pages written in white, reduced‑size type with unusual word fragmentation designed to hide instructions from human readers and influence AI tools that summarize filings.
- Minister Cristiano Zanin fined the defense two minimum wages, sent the lawyer's conduct to the Ordem dos Advogados do Brasil and the Federal Public Ministry for review, and forwarded the matter to the First Panel for virtual plenary judgment.
- The insertion produced no practical change to the minister's decision because Zanin's office does not use AI for case analysis and the defense lawyer has acknowledged using the hidden commands in the appeal that challenges a removal of a Black public servant in Minas Gerais.
- The case exposes a new vulnerability as courts adopt AI-assisted workflows and could prompt disciplinary sanctions, criminal probes, and technical safeguards for electronic filing systems as authorities monitor OAB and MPF inquiries.