I was able to isolate the main problem.
It's due to another plugin : HTML5 Notifier Plugin which breaks CSRF protection.
There is an active bug about this problem : JENKINS-13038
You can reproduce with these steps :
plugin mantis and html5 notifier in jenkins plugin directory
activate CSRF protection with "Default Crumb Issuer"
test verify action
Sébastien Heurtematte
added a comment - I was able to isolate the main problem.
It's due to another plugin : HTML5 Notifier Plugin which breaks CSRF protection.
There is an active bug about this problem : JENKINS-13038
You can reproduce with these steps :
plugin mantis and html5 notifier in jenkins plugin directory
activate CSRF protection with "Default Crumb Issuer"
test verify action
jieryn
added a comment - html5-notifier-plugin:1.2 was released: http://maven.jenkins-ci.org/content/repositories/releases/org/jenkins-ci/plugins/html5-notifier-plugin/1.2/
I can not reproduce it.
Let me know how to reporoduce?