UBUNTU-CVE-2026-40295 (CVE-2026-40295)
Vulnerability from osv_ubuntu – Published: 2026-05-22 20:16 – Updated: 2026-05-27 19:09 – Source websiteDevise 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.
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-devise",
"binary_version": "3.5.6-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "ruby-devise",
"purl": "pkg:deb/ubuntu/ruby-devise@3.5.6-2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "4.4.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "ruby-devise",
"purl": "pkg:deb/ubuntu/ruby-devise@4.4.3-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.2.0-1",
"4.3.0-1",
"4.4.3-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-devise",
"binary_version": "4.7.1-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "ruby-devise",
"purl": "pkg:deb/ubuntu/ruby-devise@4.7.1-2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.5.0-3",
"4.6.2-2",
"4.7.1-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-devise",
"binary_version": "4.7.3-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "ruby-devise",
"purl": "pkg:deb/ubuntu/ruby-devise@4.7.3-2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.7.3-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-devise",
"binary_version": "4.9.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "ruby-devise",
"purl": "pkg:deb/ubuntu/ruby-devise@4.9.3-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.8.1-1",
"4.9.2-1",
"4.9.3-1"
]
}
],
"aliases": [],
"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 \u2014 the HTTP Referer header, which is attacker-controllable \u2014 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\u0027s 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\u0027 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.",
"id": "UBUNTU-CVE-2026-40295",
"modified": "2026-05-27T19:09:50Z",
"published": "2026-05-22T20:16:00Z",
"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"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-40295"
]
}
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