CVE-2026-40295

CVE-2026-40295 affects Devise (Rails/Warden) where FailureApp#redirect_url returns request.referrer for non-GET timeouts, enabling open redirects to attacker-controlled URLs. This occurs in Devise 5.0.3 and earlier and can cause phishing or malware delivery by redirecting expired-session users to...

CVE-2026-40295

Devise is an authentication solution for Rails based on Warden. In versions 5.0.3 and below, when the Timeoutable module is enabled in Devise, the FailureAppredirecturl method returns request.referrer — the HTTP Referer header, which is attacker-controllable — without validation for any non-GET...

Devise has an Open Redirect via Unvalidated `request.referrer` in Timeoutable Session Timeout Handler

Summary When the Timeoutable module is enabled in Devise, the FailureAppredirecturl method returns request.referrer — the HTTP Referer header, which is attacker-controllable — without validation for any non-GET request that results in a session timeout. An attacker who hosts a page with an...