FreeBSD: VID-ada8db8a-8471-11e9-8170-0050562a4d7b (CVE-2019-12300): buildbot -- OAuth Authentication Vulnerability

Buildbot accepted user-submitted authorization token from OAuth and used it to authenticate user. The vulnerability can lead to malicious attackers to authenticate as legitimate users of a Buildbot instance without knowledge of the victim's login credentials on certain scenarios. If an attacker has an application authorized to access data of another user at the same Identity Provider as the used by the Buildbot instance, then he can acquire a token to access the data of that user, supply the token to the Buildbot instance and successfully login as the victim.