"The-0utl4w" discovered that the Kronolith, calendar component for the Horde Framework, didn't properly sanitise URL input, leading to a cross-site scripting vulnerability in the add event screen.
For the stable distribution (etch), this problem has been fixed in version 2.1.4-1etch1.
For the unstable distribution (sid), this problem has been fixed in version 2.1.8-1.
We recommend that you upgrade your kronolith2 package.
MD5 checksums of the listed files are available in the original advisory.