WordPress released today a security release 3.9.2 which they fix several security issues, including a denial of service issue around XML. The corresponding Debian package 3.9.2+dfsg-1 is currently being uploaded to the Debian ftp-master server as I write this and should be available on the mirrors soon.
Unfortunately at the time of writing, there are no CVE identifiers to match these problems up with, but refer to the wordpress page for details about these bugs.
Andrew Nacin from WordPress has kindly outlined what versions are susceptible and it looks like the Debian squeeze (3.6.1+dfsg-1~deb6u4) and wheezy (3.6.1+dfsg-1~deb7u3) are vulnerable to at least some of these bugs which means for me its patch reading and back-porting time
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