Matt Taggart uploaded new packages for wordpress which fixed the
following security problem:

Critical core security bug in the HTML sanitation library
  more info: http://wp.me/pZhYe-qt

For the lenny-backports distribution the problems have been fixed in
version 3.0.4+dfsg-1~bpo50+1.

Upgrade instructions
--------------------

If you don't use pinning (see [1]) you have to update the package
manually via "apt-get -t lenny-backports install <packagelist>" with
the packagelist of your installed packages affected by this update.
[1] <https://backports.debian.org/Instructions>

We recommend to pin (in /etc/apt/preferences) the backports repository to
200 so that new versions of installed  backports will be installed
automatically.

  Package: *
  Pin: release a=lenny-backports
  Pin-Priority: 200