sympa -- Denial of service caused by malformed CSRF token

Javier Moreno discovered a vulnerability in Sympa web
interface that can cause denial of service (DoS) attack.
By submitting requests with malformed parameters, this
flaw allows to create junk files in Sympa’s directory
for temporary files. And particularly by tampering token
to prevent CSRF, it allows to originate exessive
notification messages to listmasters.