GitHub disclosed late Monday it is investigating unauthorized access to the company's internal repositories, though the Microsoft-owned platform said it has found no evidence of impact to customer data stored outside its internal systems.

The company made the disclosure in a Twitter post, stating it is "closely monitoring our infrastructure for follow-on activity" while the investigation continues.

GitHub said customer enterprises, organizations, and repositories appear unaffected based on current findings. The platform hosts over 100 million repositories and serves as critical infrastructure for software development across the technology industry.

The company committed to notify customers through "established incident response and notification channels" if any impact to customer data is discovered during the ongoing investigation.

GitHub has not disclosed the scope of the breach, how long unauthorized access may have persisted, or what specific internal repositories were accessed. The company also has not identified the threat actors behind the incident.

This marks the latest security incident affecting a major technology platform. GitHub previously experienced a security breach in 2022 when attackers accessed some private repositories after stealing OAuth tokens from third-party integrators.

The timing comes as AI coding assistants like Cursor and GitHub's own Copilot have increased developer reliance on code repositories for training and assistance. Any compromise of GitHub's internal systems could potentially expose proprietary algorithms or security practices.

GitHub processes millions of code commits daily and maintains repositories for major technology companies, open-source projects, and government agencies. The platform's internal repositories likely contain sensitive information about GitHub's own operations, security measures, and product development.

The company said it will provide updates as the investigation progresses. GitHub's incident response team typically coordinates with law enforcement and security researchers during major security events.