An underscore security update has been released for Debian GNU/Linux 10 to address a missing input sanitizing.

DSA 4883-1: underscore security update

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Debian Security Advisory DSA-4883-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
April 01, 2021   https://www.debian.org/security/faq
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Package : underscore
CVE ID : CVE-2021-23358
Debian Bug : 986171

It was discovered that missing input sanitising in the template()
function of the Underscore JavaScript library could result in the
execution of arbitrary code.

For the stable distribution (buster), this problem has been fixed in
version 1.9.1~dfsg-1+deb10u1.

We recommend that you upgrade your underscore packages.

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

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/