GitHub Security Update: Reused password attack
What happened? On Tuesday evening PST, we became aware of unauthorized attempts to access a large number of GitHub.com accounts. This appears to be the result of an attacker using…
What happened?
On Tuesday evening PST, we became aware of unauthorized attempts to access a large number of GitHub.com accounts. This appears to be the result of an attacker using lists of email addresses and passwords from other online services that have been compromised in the past, and trying them on GitHub accounts. We immediately began investigating, and found that the attacker had been able to log in to a number of GitHub accounts.
GitHub has not been hacked or compromised.
What information was involved?
For affected accounts, usernames and passwords are involved. Additionally, for some accounts, other personal information including listings of accessible repositories and organizations may have been exposed.
What we are doing:
In order to protect your data we’ve reset passwords on all affected accounts. We are in the process of sending individual notifications to affected users.
What you can do:
If your account was impacted, we are in the process of contacting you directly with information about how to reset your password and restore access to your account.
We encourage all users to practice good password hygiene and enable two-factor authentication to protect your account.
These attacks often evolve, and we’re continuing to investigate and monitor for new attack vectors. Please keep an eye on our blog and on Twitter for pertinent updates, or contact Support if you have any questions.
Written by
Related posts
Introducing Agent HQ: Any agent, any way you work
At Universe 2025, GitHub’s next evolution introduces a single, unified workflow for developers to be able to orchestrate any agent, any time, anywhere.
Octoverse: A new developer joins GitHub every second as AI leads TypeScript to #1
In this year’s Octoverse, we uncover how AI, agents, and typed languages are driving the biggest shifts in software development in more than a decade.
Announcing the 2025 GitHub Partner Award winners 🎉
GitHub celebrates its 2025 Partner Award winners, honoring global, regional, and technology partners for driving innovation, collaboration, and impact across the developer ecosystem.