A xorg-server security update has been released for Debian GNU/Linux 10 to address an issue in the XKB extension.

DSA 4803-1: xorg-server security update

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Debian Security Advisory DSA-4803-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
December 04, 2020   https://www.debian.org/security/faq
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Package : xorg-server
CVE ID : CVE-2020-14360 CVE-2020-25712

Jan-Niklas Sohn discovered that the XKB extension of the Xorg X server
performed incomplete input validation, which could result in privilege
escalation.

For the stable distribution (buster), these problems have been fixed in
version 2:1.20.4-1+deb10u2.

We recommend that you upgrade your xorg-server packages.

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

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/