# RubyGem omniauth-facebook access token security vulnerability There is a security vulnerability in the omniauth-facebook <= 1.5.0. Versions affected: <= 1.5.0 Fixed versions: >= 1.5.1 ## Impact Because omniauth-facebook <= 1.5.0 supports passing an access token directly in the URL, an attacker may be able to authenticate as another user by passing a valid access token obtained from Facebook for another app. If you're currently using this feature, and passing the access token directly, you should change your integration to use one of the secure methods using either a signed request or the code flow. These secure methods are default, so unless you are explicitly passing an access token you should not need to make any integration changes to upgrade to 1.5.1. All users running an affected release should upgrade to >= 1.5.1. ## Releases The 1.5.1 releases is available at the normal locations. ## Workarounds None. ## Credits Egor Homakov (@homakov)