![](https://github.blog/wp-content/uploads/2019/09/security-2016-1204.png?resize=800%2C425)
GitHub security update: A bug related to handling of authenticated sessions
Why did I get logged out of GitHub.com? On the evening of March 8, we invalidated all authenticated sessions on GitHub.com created prior to 12:03 UTC on March 8 out…
![](https://github.blog/wp-content/uploads/2019/09/security-2016-1204.png?resize=800%2C425)
Mike Hanley is the Chief Security Officer and SVP of Engineering at GitHub. Prior to GitHub, Mike was the Vice President of Security at Duo Security, where he built and led the security research, development, and operations functions. After Duo’s acquisition by Cisco for $2.35 billion in 2018, Mike led the transformation of Cisco’s cloud security framework and later served as CISO for the company. Mike also spent several years at CERT/CC as a Senior Member of the Technical Staff and security researcher focused on applied R&D programs for the US Department of Defense and the Intelligence Community.
When he’s not talking about security at GitHub, Mike can be found enjoying Ann Arbor, MI with his wife and eight kids.
Why did I get logged out of GitHub.com? On the evening of March 8, we invalidated all authenticated sessions on GitHub.com created prior to 12:03 UTC on March 8 out…
The world runs on software, and a large portion of it, especially the open source software that’s part of everything we experience, is built by millions of developers on GitHub…