Did you get logged out of GitHub? - Backend Race condition Bug discussion

On the evening of March 8, GitHub invalidated all authenticated sessions on GitHub.com created prior to 12:03 UTC on March 8 out of an abundance of caution to protect users from an extremely rare, but potentially serious, security vulnerability affecting a very small number of GitHub.com sessions.

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https://github.blog/2021-03-08-github-security-update-a-bug-related-to-handling-of-authenticated-sessions/