A vandal has been able to flag edits as if they were made by a bot on en.wiktionary and en.wikiversity. I was unable to do this merely by using the API edit with an "&bot" on a user without permissions, so I suspect it is some other bug.
The edits on en.wiktionary can be found here:
http://en.wiktionary.org/w/index.php?namespace=3&tagfilter=&from=20110924021000&hidebots=&hideanons=1&hideliu=1&title=Special%3ARecentChanges
Same user on en.wikibooks:
http://en.wikibooks.org/w/index.php?namespace=0&tagfilter=&hidebots=&hideanons=1&hideliu=1&title=Special%3ARecentChanges
Version: 1.17.x
Severity: major