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WordPress 2.3.1 is a bug-fix and security release for the 2.3 series.

Over twenty issues were fixed, including tagging support for Windows Live Writer, a login bug that affected those with a Blog Address different than their WordPress Address, and faster taxonomy database queries.

Also some security issues were found in version 2.3. “Janek Vind found an XSS problem that can be exploited if your PHP setup has register_globals enabled. For this reason, upgrading to 2.3.1 is advised.”

For additional information, please read the release announcement.