A roundcube security update has been released for both Debian GNU/Linux 9 and 10 to address CSRF and XSS issues.

DSA 4674-1: roundcube security update

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Debian Security Advisory DSA-4674-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
May 05, 2020   https://www.debian.org/security/faq
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Package : roundcube
CVE ID : CVE-2020-12625 CVE-2020-12626
Debian Bug : 959140 959142

It was discovered that roundcube, a skinnable AJAX based webmail
solution for IMAP servers, did not correctly process and sanitize
requests. This would allow a remote attacker to perform either a
Cross-Site Request Forgery (CSRF) forcing an authenticated user to be
logged out, or a Cross-Side Scripting (XSS) leading to execution of
arbitrary code.

For the oldstable distribution (stretch), these problems have been fixed
in version 1.2.3+dfsg.1-4+deb9u4.

For the stable distribution (buster), these problems have been fixed in
version 1.3.11+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/