A rails security update has been released for Debian GNU/Linux 9 LTS to address a potential Cross-Site Scripting (XSS) vulnerability was found in rails, a ruby based MVC framework.

DLA 2403-1: rails security update

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Debian LTS Advisory DLA-2403-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
October 09, 2020   https://wiki.debian.org/LTS
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Package : rails
Version : 2:4.2.7.1-1+deb9u4
CVE ID : CVE-2020-15169
Debian Bug : 970040

A potential Cross-Site Scripting (XSS) vulnerability was found in rails,
a ruby based MVC framework. Views that allow the user to control the
default (not found) value of the `t` and `translate` helpers could be
susceptible to XSS attacks. When an HTML-unsafe string is passed as the
default for a missing translation key named html or ending in _html, the
default string is incorrectly marked as HTML-safe and not escaped.

For Debian 9 stretch, this problem has been fixed in version
2:4.2.7.1-1+deb9u4.

We recommend that you upgrade your rails packages.

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

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS