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Matthew Elliott Sanctioned by Connecticut Judge for First Documented Prompt Injection Attack in U.S. Court

Matthew Elliott, a pro se plaintiff, was sanctioned by Connecticut Superior Court Judge Walter Spader Jr. for attempting to use a prompt injection attack in a legal filing. Elliott included hidden text, formatted in white on a white background, to instruct an artificial intelligence system to favor his arguments and ensure remediation. Because the Connecticut Judicial Branch does not currently use AI to review filings, the hidden instructions were invisible to human readers but were intended to influence any machine that scanned the text. Judge Walter Spader Jr. characterized the move as a "serious litigation abuse" that "defies logic," noting that the plaintiff continued to add hidden jokes and messages even after being warned. While Elliott claimed he was auditing the court's AI usage, the judge ruled that the hidden text was a covert way to smuggle instructions into the stream of the legal process. As a result, the judge banned Elliott from using the court's electronic filing system, requiring him to submit all future paperwork in person on paper. The ruling serves as a warning that as AI becomes more common in legal systems, litigants may use hidden prompts to manipulate outcomes without the user's knowledge.

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