Last modified: 2014-01-13 10:48:48 UTC
See the hidden comment in https://www.mediawiki.org/w/index.php?title=Talk:Sandbox&topic[postId]=050bbdd07b70a1c028b2782bcb087b42&workflow=050bbdd07b64a1c028b2782bcb087b42#flow-post-050bbdd07b70a1c028b2782bcb087b42
The WMF core features team tracks this bug on Mingle card https://mingle.corp.wikimedia.org/projects/flow/cards/622, but people from the community are welcome to contribute here and in Gerrit.
AbuseFilter integration fixed this. Filter for this type of content: https://www.mediawiki.org/wiki/Special:AbuseFilter/29