We released Jenkins updates today that include important security fixes: 1.641 and 1.625.3. For detailed information about the security content of these updates, see the security advisory.
One of these fixes, SECURITY-95, results in possible problems in plugins such as Maven Plugin, Javadoc Plugin, and HTML Publisher Plugin, so make sure to read all about that in the wiki.
Please note that the update site may lag a bit behind. If you want to update as soon as possible, download the releases from our site.