A new update is available for Fedora Core - [SECURITY] Fedora Core 4 Update: squirrelmail-1.4.6-0.cvs20050812.1.fc4. Here the announcement:

Fedora Update Notification
FEDORA-2005-780
2005-08-22
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Product : Fedora Core 4
Name : squirrelmail
Version : 1.4.6
Release : 0.cvs20050812.1.fc4
Summary : SquirrelMail webmail client
Description :
SquirrelMail is a standards-based webmail package written in PHP4. It
includes built-in pure PHP support for the IMAP and SMTP protocols, and
all pages render in pure HTML 4.0 (with no Javascript) for maximum
compatibility across browsers. It has very few requirements and is very
easy to configure and install. SquirrelMail has all the functionality
you would want from an email client, including strong MIME support,
address books, and folder manipulation.

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Update Information:

It probably is not a good idea to push a CVS snapshot here,
but upstream screwed up their 1.4.5 release and CVS contains
further fixes like PHP5 related stuff that might make
squirrelmail usable on FC4. This snapshot worked on my
personal server for the past week, so hopefully it will be
good for everyone else too.

CAN-2005-1769 and CAN-2005-2095 security issues are solved
in this update.

Please report regressions in behavior from our previous
1.4.4 package to Red Hat Bugzilla, product Fedora Core. All
other squirrelmail bugs please report upstream.
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* Sun Aug 14 2005 Warren Togami <wtogami@redhat.com> 1.4.6-0.cvs20050812.1
- snapshot of 1.4.6 because 1.4.5 upstream was a bad release
this hopefully will also work on PHP5 too...

* Mon Jun 20 2005 Warren Togami <wtogami@redhat.com> 1.4.5-0.rc1
- 1.4.5-0.rc1


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This update can be downloaded from:
http://download.fedora.redhat.com/pub/fedora/linux/core/updates/4/

508ddbe3e2fadfd928529173321aecb4 SRPMS/squirrelmail-1.4.6-0.cvs20050812.1.fc4.src.rpm
8de6255428c1ba23029430ca8a4e0e43 x86_64/squirrelmail-1.4.6-0.cvs20050812.1.fc4.noarch.rpm
8de6255428c1ba23029430ca8a4e0e43 i386/squirrelmail-1.4.6-0.cvs20050812.1.fc4.noarch.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the 'up2date' command.