Disney is investigating a significant hack of its internal Slack channels. A hacker group known as Nullbulge claims to have stolen over 1 terabyte of data, leaking sensitive company information.

Nullbulge, a self-proclaimed “hacktivist” group, aims to protect artists’ rights and ensure fair compensation. They posted screenshots of documents, including traffic and revenue data for Disneyland Paris and a new streaming feature for personalized Disney content recommendations. The group promises to release all the data online, which reportedly includes details about unreleased projects, raw images, and computer code.

The Wall Street Journal confirmed viewing some of the leaked files, which contained discussions about maintaining Disney’s corporate website, software development, employment assessments, and even photos of employees’ dogs, dating back to 2019.

A Disney spokesperson stated, “Disney is investigating this matter.” Variety has contacted Nullbulge for comment.

This breach brings to mind the infamous Sony Pictures hack a decade ago, one of the most significant corporate data breaches in U.S. history. That incident involved leaked emails and internal communications, causing major disruptions and leading to the resignation of key executives.

As Disney spans various sectors, including Marvel Studios, Lucasfilm, Disney+, Hulu, ESPN, and theme parks, this hack raises concerns about the potential impact on its vast array of businesses.