A drupal7 security update has been released for Debian GNU/Linux 9 LTS to address a vulnerability in the sanitization performed in the _filter_xss_arttributes function.

DLA-2637-1: drupal7 security update

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Debian LTS Advisory DLA-2637-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Gunnar Wolf
April 23, 2021   https://wiki.debian.org/LTS
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Package : drupal7
Version : 7.52-2+deb9u15

The Drupal project identified a vulnerability in the sanitization
performed in the _filter_xss_arttributes function, potentially
allowing a cross-site scripting, and granted it the Drupal Security
Advisory ID SA-CORE-2021-002:

  https://www.drupal.org/sa-core-2021-002

No CVE number has been announced.

For Debian 9 "Stretch", the fix to this issue was backported in
version 7.52-2+deb9u15.

We recommend you upgrade your drupal7 package.

For detailed security status of drupal7, please refer to its security
tracker page:

  https://security-tracker.debian.org/tracker/source-package/drupal7

Further information about Debian LTS security advisories, how to
apply these updates to your system, and other frequently asked
questions can be found at:

  https://wiki.debian.org/LTS