Unfortunately, 2.2.1 is not just a bug fix release. Some security issues came to light during 2.2.1 development, making 2.2.1 a required upgrade. 2.2.1 addresses the following vulnerabilities:
* Remote shell injection in PHPMailer
* Remote SQL injection in XML-RPC Discovered by Alexander Concha.
* Unescaped attribute in default theme
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