CVE-2021-44528: Rubyonrails Rails

Medium severity, CVSS 6.1. EPSS: 4.2% chance of exploitation in the next 30 days.

A open redirect vulnerability exists in Action Pack >= 6.0.0 that could allow an attacker to craft a "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.

Affected products

• Rubyonrails Rails: version 6.0.4.2 only; version 6.1.4.2 only; version 7.0.0 only

Published 2022-01-10. Last modified 2026-06-17.