Vulnerable Library - devise-5.0.3.gem
Flexible authentication solution for Rails with Warden
Library home page: https://rubygems.org/gems/devise-5.0.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/devise-5.0.3.gem
Found in HEAD commit: da0c9c84fdbc82b3b8e2221482a86225136e26be
Vulnerabilities
| Vulnerability |
Severity |
 CVSS |
Dependency |
Type |
Fixed in (devise version) |
Remediation Possible** |
| CVE-2026-40295 |
 Medium |
6.1 |
devise-5.0.3.gem |
Direct |
devise - 5.0.4 |
❌ |
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
CVE-2026-40295
Vulnerable Library - devise-5.0.3.gem
Flexible authentication solution for Rails with Warden
Library home page: https://rubygems.org/gems/devise-5.0.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/devise-5.0.3.gem
Dependency Hierarchy:
- ❌ devise-5.0.3.gem (Vulnerable Library)
Found in HEAD commit: da0c9c84fdbc82b3b8e2221482a86225136e26be
Found in base branch: main
Vulnerability 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.
Publish Date: 2026-05-22
URL: CVE-2026-40295
CVSS 3 Score Details (6.1)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- Scope: Changed
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.
Suggested Fix
Type: Upgrade version
Origin: GHSA-jp94-3292-c3xv
Release Date: 2026-05-09
Fix Resolution: devise - 5.0.4
Step up your Open Source Security Game with Mend here
Flexible authentication solution for Rails with Warden
Library home page: https://rubygems.org/gems/devise-5.0.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/devise-5.0.3.gem
Found in HEAD commit: da0c9c84fdbc82b3b8e2221482a86225136e26be
Vulnerabilities
**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation
Details
Vulnerable Library - devise-5.0.3.gem
Flexible authentication solution for Rails with Warden
Library home page: https://rubygems.org/gems/devise-5.0.3.gem
Path to dependency file: /Gemfile.lock
Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/devise-5.0.3.gem
Dependency Hierarchy:
Found in HEAD commit: da0c9c84fdbc82b3b8e2221482a86225136e26be
Found in base branch: main
Vulnerability 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.
Publish Date: 2026-05-22
URL: CVE-2026-40295
CVSS 3 Score Details (6.1)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- Scope: Changed
- Impact Metrics:
- Confidentiality Impact: Low
- Integrity Impact: Low
- Availability Impact: None
For more information on CVSS3 Scores, click here.Suggested Fix
Type: Upgrade version
Origin: GHSA-jp94-3292-c3xv
Release Date: 2026-05-09
Fix Resolution: devise - 5.0.4
Step up your Open Source Security Game with Mend here