Reddit fell victim to a hacker who gained access to some internal documents, code and systems at the social media company.

Reddit executive Christopher Slowe revealed the breach in a post saying the hacker waged a sophisticated phishing campaign targeting employees.

The hacker used a dummy website mimicking Reddit’s internal system in an effort to steal employees’ credentials and multifactor authentication information.

“After successfully obtaining a single employee’s credentials, the attacker gained access to some internal docs, code, as well as some internal …