A davical security update has been released for both Debian GNU/Linux 9 and 10

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Debian Security Advisory DSA-4582-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
December 13, 2019 https://www.debian.org/security/faq
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Package : davical
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 the oldstable distribution (stretch), these problems have been fixed
in version 1.1.5-1+deb9u1.

For the stable distribution (buster), these problems have been fixed in
version 1.1.8-1+deb10u1.

We recommend that you upgrade your davical packages.

For the detailed security status of davical please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/davical

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