Possible XSS Vulnerability in Action Controller

There is a possible XSS vulnerability when using the translation helpers (translate, t, etc) in Action Controller. This vulnerability has been assigned the CVE identifier CVE-2024-26143.

Versions Affected: >= 7.0.0. Not affected: < 7.0.0 Fixed Versions:,


Applications using translation methods like translate, or t on a controller, with a key ending in “_html”, a :default key which contains untrusted user input, and the resulting string is used in a view, may be susceptible to an XSS vulnerability.

For example, impacted code will look something like this:

class ArticlesController < ApplicationController
  def show  
    @message = t("message_html", default: untrusted_input)
    # The `show` template displays the contents of `@message`

To reiterate the pre-conditions, applications must:

  • Use a translation function from a controller (i.e. not I18n.t, or t from a view)
  • Use a key that ends in _html
  • Use a default value where the default value is untrusted and unescaped input
  • Send the text to the victim (whether that’s part of a template, or a render call)

All users running an affected release should either upgrade or use one of the workarounds immediately.


The fixed releases are available at the normal locations.


There are no feasible workarounds for this issue.


To aid users who aren’t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.

  • 7-0-translate-xss.patch - Patch for 7.0 series
  • 7-1-translate-xss.patch - Patch for 7.1 series


Thanks to ooooooo_q for the patch and fix!

7-0-translate-xss.patch (4.2 KB) 7-1-translate-xss.patch (4.1 KB)

4 Likes contained a small bug in not respecting raise_on_missing_translations for controller translations. has been released with a fix for the bug (and no other changes).

1 Like

Amending to this CVE, all version below 7.0.0 aren’t vulnerable to this issue.