If you are using Webmin within your network to administer Unix services, you should consider upgrading to the latest version 1.594 because an input validation vulnerabilities has been reported in version prior to and including 1.580. The latest version can be downloaded here or the update can be done directly in Webmin (Via menu Webmin, Webmin Configuration and Upgrade Webmin).

CVE-2012-2981 - Improper Input Validation
CVE-2012-2982 - Improper Neutralization of Special Elements used in a Command
CVE-2012-2983 - Improper Limitation of a Pathname to a Restricted Directory

[1] http://www.kb.cert.org/vuls/id/788478
[2] http://www.webmin.com/download.html
[3] http://download.webmin.com/devel/tarballs/

Note: Updated link to the latest tarball.

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot edu