Bitbucket Branch Source Plugin 886.v44cf5e4ecec5 and earlier prints the Bitbucket OAuth access token as part of the Bitbucket URL in the build log in some cases. Bitbucket Branch Source Plugin 887.va_d359b_3d2d8d does not include the Bitbucket OAuth access token as part of the Bitbucket URL in the build log.
In Jenkins Bitbucket Branch Source Plugin 866.vdea_7dcd3008e and earlier, except 848.850.v6a_a_2a_234a_c81, when discovering pull requests from forks, the trust policy "Forks in the same account" allows changes to Jenkinsfiles from users without write access to the project when using Bitbucket Server.
A missing permission check in Jenkins Bitbucket Branch Source Plugin 737.vdf9dc06105be and earlier allows attackers with Overall/Read access to enumerate credentials IDs of credentials stored in Jenkins.
A cross-site request forgery (CSRF) vulnerability in Jenkins Bitbucket Branch Source Plugin 737.vdf9dc06105be and earlier allows attackers to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.