The spellchecker (spellcheck.php) in DokuWiki 2006/06/04 and earlier allows remote attackers to insert and execute arbitrary PHP code via "complex curly syntax" that is inserted into a regular expression that is processed by preg_replace with the /e (executable) modifier.
AV:N/AC:L/Au:N/C:P/I:P/A:P
This vulnerability has a 13.93% probability of being exploited in the next 30 days, ranking higher than 96% of all scored CVEs.