It was discovered that firefox-sage, a lightweight RSS and Atom feed reader for Firefox, does not sanitise the RSS feed information correctly, which makes it prone to a cross-site scripting and a cross-domain scripting attack. For the stable distribution , this problem has been fixed in version 1.4.2-0.1+lenny1. For the oldstable distribution , this problem has been fixed in version 1.3.6-4etch1. For the testing distribution and the unstable distribution , this problem has been fixed in version 1.4.3-3. We recommend that you upgrade your firefox-sage packages.