DotClear contains a flaw that may allow an attacker to carry out an SQL injection attack. The issue is due to the session.php script not properly sanitizing user-supplied input to the 'dc_xd' cookie variable. This may allow an attacker to inject or manipulate SQL queries in the back-end database.
Upgrade to version 1.2.3 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.