A hacking group reportedly leaked confidential data from thousands of Disney Slack channels.

A hacking group leaked over a terabyte of confidential data from more than 10,000 Slack channels belonging to Disney, the Wall Street Journal reported on Monday. The leaked information includes discussions about ad campaigns, computer code, details about unreleased projects and discussion about interview candidates among other things. “Disney is investigating this matter,” a company spokesperson told the Journal.

Nullbulge calls itself a hacktivist group advocating for the rights of artists. A spokesperson for the group told the Journal that it targeted Disney due to concerns about the company’s handling of artist contracts and its approach to generative AI. For weeks, the group teased its access to Disney’s Slack, posting snippets of confidential information such as attendance figures for Disneyland parks on X. Nullbulge told the Journal that it accessed Disney’s confidential information by compromising an employee’s computer computer twice, including through malicious software that it buried in a videogame add-on.

For more than a year, generative AI has sparked tensions between the companies that make and use the tech and members of the creative community who have accused corporations of using their work to train AI models without consent or compensation.