We are sunsetting Hakiri on January 31 2022. To learn more please refer to this document.


Published about 1 month ago
Category: Redirect
Severity: Severe

Vulnerability in actionpack

There is a possible open redirect vulnerability in the Host Authorization middleware in Action Pack.

Specially crafted “X-Forwarded-Host” headers in combination with certain “allowed host” formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website.

Impacted applications will have allowed hosts with a leading dot. For example, configuration files that look like this:

config.hosts <<  '.EXAMPLE.com'

When an allowed host contains a leading dot, a specially crafted Host header can be used to redirect to a malicious website.

This vulnerability is similar to CVE-2021-22881 and CVE-2021-22942.


The fixed releases are available at the normal locations.


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.

  • 6-0-host-authorzation-open-redirect.patch - Patch for 6.0 series
  • 6-1-host-authorzation-open-redirect.patch - Patch for 6.1 series
  • 7-0-host-authorzation-open-redirect.patch - Patch for 7.0 series

Please note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.

CVSS Metrics
Access Vector Access Complexity Authentication Confidentiality Impact Integrity Impact Availability Impact
n/a n/a n/a n/a n/a n/a
Patched Versions

~> 6.0.4 >= ~> 6.1.4 >= >= 7.0.0.rc2

Unaffected Versions

< 6.0.0