A CSRF flaw was reported , in the way Horde Groupware handled requests to change permissions. Due to a missing unique token in the form, an attacker with knowledge of the victim's name and address book ID could transmit unauthorized commands to Horde Groupware as the victim.
This has been fixed in git. 
Created horde tracking bugs for this issue:
Affects: fedora-all [bug 1026494]
Affects: epel-all [bug 1026496]
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.