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1/ We are sharing additional details regarding our investigation into unauthorized access to GitHub's internal repositories.

2/ On Monday, we detected and contained a compromise of an employee device involving a poisoned VS Code extension. We removed the malicious extension version, isolated the endpoint, and began incident response immediately.

3/ Our current assessment is that the activity involved exfiltration of GitHub-internal repositories only. The attacker’s current claims of ~3,800 repositories are directionally consistent with our investigation so far.

4/ We moved quickly to reduce risk. Critical secrets were rotated on Monday and into Tuesday with the highest-impact credentials prioritized first.