Serendipity 1.1.2 was
released on
March 1st, 2007. It looks like this is mainly a minor bug fix (the perceived SQL injection issue among one of them).
Update (6/20/07): It looks like there was an SQL injection bug introduced in Serendipity 1.1 (prior versions are not affected), which has been fixed in Serendipity 1.1.3 and 1.2-beta2. All users on
Serendipity 1.1 or
Serendipity 1.2 are encouraged to upgrade.