Court papers show ACC's had yet another major privacy breach problem.
A High Court decision handed down by Justice Young late last month reveals ACC had to take legal steps to prevent a man publicly releasing another person's case notes the corporation had sent him in error.
Justice Young's ruling prevents the man from releasing the documents while further legal remedies are sought.
Green MP Kevin Hague says for this latest breach to involve the same kind of mistake so soon after the Pullar case indicates ACC is in free fall over privacy issues.
"They're not actually taking any steps it seems to remedy even the weaknesses that they know about in their privacy systems."
ACC so far isn't commenting on the case but Newstalk ZB understands the case is a new incident and is separate from other privacy breaches the corporation has already publicly acknowledged this year.