In resources (updated) — I've corrected a potential security hole. The following plugins are involved:

• Semiologic CMS plugin, up to v.2.5.3
• Smarts link plugin, up to v.1.3
• Search reloaded plugin, up to v.0.6

You should update ASAP if you are using any of them.

See also, with respect to upgrading the Semiologic CMS plugin:

• Upgrade instructions to v.2.5.x, from v.2.4
• Upgrade instructions to v.2.4, from v.2.3
• Upgrade instructions to v.2.3

Short short version, for users of the v.2.4 and below:

• Deactivate and delete every plugins from my site (see the first comment to see what happens if you don't)
• Upload the new versions of the theme and of the plugins
• Enjoy (the autoinstall will do the rest)