-a su that has a similar hole fixed; [[!debbug 628843]] tracks fixing
-the hole in Debian's su. An upgrade is a must for any sites whose
-admins run ikiwiki-mass-rebuild.
+a version of su that has a similar hole fixed; [[!debbug 628843]]
+tracks fixing the hole in Debian's su. An upgrade is a must for any
+sites that have `ikiwiki-update-wikilist` installed suid (not the default),
+and whose admins run `ikiwiki-mass-rebuild`.