- 
    Bug 
- 
    Resolution: Fixed
- 
    Major 
- 
    None
- 
    Jenkins 2.7.4
https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2016-05-11
The plugin is no longer working out-of-the-box because of SECURITY-170. As a temporary workaround, adding the following launch command to Jenkins does work:
-Dhudson.model.ParametersAction.safeParameters=assemblaSourceSpaceId,assemblaAuthorName,assemblaDescription,assemblaSourceRepositoryUrl,assemblaTargetBranch,assemblaSourceRepositoryName,assemblaTargetRepositoryUrl,assemblaMergeRequestId,assemblaRefName,assemblaSourceBranch