If you’re running an outdated version of Plesk, you’re putting your server and its users at risk. Parallels® recently identified a SQL injection security vulnerability on older versions of Plesk. You can learn more about that incident here.
Running older versions of Plesk can also open your server to malicious outbound flooding attacks. Avoid these security vulnerabilities and keep your control panel updated. You can install the latest micro-update patches from your Plesk control panel. For more information, click here.
For more information about upgrading Plesk, check out the Parallels® Plesk Panel 10.4: Installation and Upgrade Guide.