[SOLVED] Basic http server with cgi alongside Moode

[Mwoua]

Well, your post helped me find the probable root cause.
The partition from where I try to run the webserver is mounted as

(rw,nosuid,nodev,noexec,noatime,nodiratime,uhelper=udisks)

It is automatically mounted by Moode (udisks-glue), so I updated /etc/udisks-glue.conf to not automount this partition, and everything works