A roundcube security update has been released for Debian GNU/Linux 10 to address a cross-site scripting vulnerability.

DSA 4821-1: roundcube security update

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Debian Security Advisory DSA-4821-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
December 28, 2020   https://www.debian.org/security/faq
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Package : roundcube
CVE ID : CVE-2020-35730
Debian Bug : 978491

Alex Birnberg discovered that roundcube, a skinnable AJAX based webmail
solution for IMAP servers, is prone to a cross-site scripting
vulnerability in handling HTML or Plain text messages with malicious
content.

For the stable distribution (buster), this problem has been fixed in
version 1.3.16+dfsg.1-1~deb10u1.

We recommend that you upgrade your roundcube packages.

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

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/