A davical security update has been released for Debian GNU/Linux 8 LTS

Package : davical
Version : 1.1.3.1-1+deb8u1
CVE ID : CVE-2019-18345 CVE-2019-18346 CVE-2019-18347
Debian Bug : 946343

Multiple cross-site scripting and cross-site request forgery issues were
discovered in the DAViCal CalDAV Server.

For Debian 8 "Jessie", these problems have been fixed in version
1.1.3.1-1+deb8u1.

We recommend that you upgrade your davical packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS