We have identified and fixed a vulnerability in Crucible which allowed unauthenticated users to commit actions on behalf of any other authorised user. In order to exploit this vulnerability, an attacker requires access to your Crucible web interface.
A Crucible server is only vulnerable if it has been configured to be a part of an Application link with Trusted Applications authentication.
The vulnerability affects all supported versions of Crucible up to and including 3.1.5 and 2.10.7. It has been fixed in 3.2.0, 3.1.6 and 2.10.8.
For more information, see our security advisory.