Hi Yves,
If you have an EE account I suggest you to open ticket with your account to get a faster response.
If not, I would try to reproduce it in latest trunk and open a ticket in LPS project with the appropriate security fields. If you can contribute a solution, that would be great, otherwise our security team can look at the issue and find a solution for it. If it's deemed an security issue, it should be backported and resolved in the next EE release.
Firmi prego dentro per inbandierare questo come inadeguato.