There is a potential Cross-Site Scripting (XSS) vulnerability in Action View's translation helpers. 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. Vulnerable code may look like the following examples:
<%# The welcome_html translation is not defined for the current locale: %>
<%= t("welcome_html", default: untrusted_user_controlled_string) %>
<%# Neither the title.html translation nor the missing.html translation is defined for the current locale: %>
<%= t("title.html", default: [:"missing.html", untrusted_user_controlled_string]) %>Patched Rails versions, 6.0.3.3 and 5.2.4.4, are available from the normal locations.
To aid users who aren’t able to upgrade immediately, we’ve provided patches for the two supported release series. They are in git-am format and consist of a single changeset.
Please note that only the 5.2 and 6.0 release series are currently supported. Users of earlier, unsupported releases are advised to update as soon as possible, as we cannot provide security fixes for unsupported releases.
Impacted users who can’t upgrade to a patched Rails version can avoid this issue by manually escaping default translations with the html_escape helper (aliased as h):
<%= t("welcome_html", default: h(untrusted_user_controlled_string)) %>
jonathanhefner Analyst
There is a potential Cross-Site Scripting (XSS) vulnerability in Action View's translation helpers. Views that allow the user to control the default (not found) value of the
tandtranslatehelpers could be susceptible to XSS attacks.Impact
When an HTML-unsafe string is passed as the default for a missing translation key named
htmlor ending in_html, the default string is incorrectly marked as HTML-safe and not escaped. Vulnerable code may look like the following examples:Patches
Patched Rails versions, 6.0.3.3 and 5.2.4.4, are available from the normal locations.
The patches have also been applied to the
master,6-0-stable, and5-2-stablebranches on GitHub. If you track any of these branches, you should update to the latest.To aid users who aren’t able to upgrade immediately, we’ve provided patches for the two supported release series. They are in git-am format and consist of a single changeset.
Please note that only the 5.2 and 6.0 release series are currently supported. Users of earlier, unsupported releases are advised to update as soon as possible, as we cannot provide security fixes for unsupported releases.
Workarounds
Impacted users who can’t upgrade to a patched Rails version can avoid this issue by manually escaping default translations with the
html_escapehelper (aliased ash):References