You can view a list of devices that have logged into your account, and revoke any sessions that you don't recognize.
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In the upper-right corner of any page on GitHub, click your profile photo, then click Settings.
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In the "Access" section of the sidebar, click Sessions.
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Under "Web sessions", you can see your active web sessions.
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To see the web session details, click See more.
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To revoke a web session, click Revoke session.