{"id":"UBUNTU-CVE-2026-40295","details":"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 FailureApp#redirect_url 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 auto-submitting cross-origin form can cause a victim with an expired Devise session to be redirected to an arbitrary external URL. This contrasts with the GET timeout path (which uses server-side attempted_path) and Devise's own store_location_for mechanism (which strips external hosts via extract_path_from_location), both of which are protected; only the non-GET timeout redirect path is unprotected. Expired-session users can be silently redirected from the trusted app domain to attacker-controlled URLs, enabling phishing and malware delivery while bypassing browser warnings. Note: Rails' built-in open-redirect protection does not mitigate this issue. Devise::FailureApp is an ActionController::Metal app with its own isolated copy of the relevant redirect configuration, so config.action_controller.action_on_open_redirect = :raise (and the older raise_on_open_redirects setting) do not reach it. This issue has been fixed in version 5.0.4.","modified":"2026-05-27T19:09:50Z","published":"2026-05-22T20:16:00Z","upstream":["CVE-2026-40295"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-40295"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-40295"},{"type":"REPORT","url":"https://github.com/heartcombo/devise/security/advisories/GHSA-jp94-3292-c3xv"},{"type":"REPORT","url":"https://github.com/heartcombo/devise/commit/025fe2124f9928766fc46520e999633b598d0360"}],"affected":[{"package":{"name":"ruby-devise","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/ruby-devise?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.1-1","3.5.2-1","3.5.2-2","3.5.2-3","3.5.6-2"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-devise","binary_version":"3.5.6-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40295.json"}},{"package":{"name":"ruby-devise","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/ruby-devise?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.0-1","4.3.0-1","4.4.3-1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.4.3-1","binary_name":"ruby-devise"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40295.json"}},{"package":{"name":"ruby-devise","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/ruby-devise?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.0-3","4.6.2-2","4.7.1-2"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-devise","binary_version":"4.7.1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40295.json"}},{"package":{"name":"ruby-devise","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/ruby-devise?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7.3-2"],"ecosystem_specific":{"binaries":[{"binary_version":"4.7.3-2","binary_name":"ruby-devise"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40295.json"}},{"package":{"name":"ruby-devise","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/ruby-devise?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.1-1","4.9.2-1","4.9.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"ruby-devise","binary_version":"4.9.3-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-40295.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}