Meta has joined a growing list of companies saying their models hacked into an external company’s system during cybersecurity testing.

In a statement on Thursday, the social media company said its Muse Spark model “exploited a security vulnerability in a third-party service, in a manner similar to previously-reported instances with other companies.”

The Meta spokesperson said the breach occurred because of a misconfiguration by Irregular, an independent company Meta uses for model testing. This led to the model accessing the internet during evaluation.

Meta added that it learned of the incident when Irregular notified the company. It says it is…