Updated movabletype-opensource packages are available for Debian GNU/Linux. Here the announcement:

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Debian Security Advisory DSA-2263-1 security@debian.org
http://www.debian.org/security/ Florian Weimer
June 16, 2011 http://www.debian.org/security/faq
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Package : movabletype-opensource
Vulnerability : several
Problem type : remote
Debian-specific: no
CVE ID : not yet available
Debian Bug : 627936

It was discovered that Movable Type, a weblog publishing system,
contains several security vulnerabilities:

A remote attacker could execute arbitrary code in a logged-in users'
web browser.

A remote attacker could read or modify the contents in the system
under certain circumstances.

For the oldstable distribution (lenny), no update is available at this
time.

For the stable distribution (squeeze), these problems have been fixed in
version 4.3.5+dfsg-2+squeeze2.

For the testing distribution (wheezy) and for the unstable
distribution (sid), these problems have been fixed in version
4.3.6.1+dfsg-1.

We recommend that you upgrade your movabletype-opensource packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/