Per Brandon Vincent:

All,

I am with the Fedora Project Security Team and we've noticed some
outstanding security issues regarding wordpress-mu.

For a detailed explanation of the security issues please see Bugzilla
reports [1] and [2].

wordpress-mu is no longer maintained by upstream and has been merged
into the regular WordPress source code.

Ideally, the wordpress-mu package and associated plug in packages
should be removed from the EPEL repositories because of their
vulnerable nature.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=687910
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1121503

We would appreciate your effort in depreciating these packages.

Thanks!