Upgrade to version 2.3.26 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.
Vendor URL: http://www.mailreader.com/
Security Tracker: 1013610
Secunia Advisory ID:14777
Secunia Advisory ID:14787
Other Advisory URL: http://www.debian.org/security/2005/dsa-700