Investigating unauthorized access to GitHub-owned repositories

A compromise involving a malicious Visual Studio Code extension was detected and contained by GitHub on May 18, affecting an employee's device and leading to the exfiltration of GitHub's internal repositories. The attacker claims to have accessed approximately 3,800 repositories, which aligns with GitHub's ongoing investigation. Although customer data beyond GitHub's internal repositories appears unaffected, GitHub has taken swift action, such as removing the malicious extension, rotating critical credentials, and monitoring their infrastructure for further activity. GitHub's Chief Information Security Officer, Alexis Wales, who has substantial experience in national and private sector cybersecurity, is overseeing the incident response. She is committed to transparency and collaboration in addressing security challenges and has pledged to notify customers if any impact is detected, with a comprehensive report to follow once the investigation concludes.

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