A roundcube security update has been released for Debian GNU/Linux 10 and 11.

DSA 5037-1: roundcube security update

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Debian Security Advisory DSA-5037-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
January 08, 2022   https://www.debian.org/security/faq
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Package : roundcube
CVE ID : CVE-2021-46144
Debian Bug : 1003027

It was discovered that roundcube, a skinnable AJAX based webmail
solution for IMAP servers, did not properly sanitize HTML
messages. This would allow an attacker to perform Cross-Side Scripting
(XSS) attacks.

For the oldstable distribution (buster), this problem has been fixed
in version 1.3.17+dfsg.1-1~deb10u2.

For the stable distribution (bullseye), this problem has been fixed in
version 1.4.13+dfsg.1-1~deb11u1.

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/