Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-40295— Devise: Open Redirect via Unvalidated `request.referrer` in Timeoutable Session Timeout Handler

Quick assessment

Affected
heartcombo devise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Devise是heartcombo开源的一个基于 Warden 的灵活的 Rails 身份验证解决方案。 Devise 5.0.3及之前版本存在输入验证错误漏洞，该漏洞源于FailureApp#redirect_url方法返回未经验证的HTTP Referer标头，可能导致开放重定向。

CVSS 6.1 · Medium EPSS 0.24% · P16

Affected Version Matrix 1

VendorProduct Version RangeStatus
heartcombo devise < 5.0.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-40295

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Devise: Open Redirect via Unvalidated `request.referrer` in Timeoutable Session Timeout Handler
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Devise 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Devise是heartcombo开源的一个基于 Warden 的灵活的 Rails 身份验证解决方案。 Devise 5.0.3及之前版本存在输入验证错误漏洞，该漏洞源于FailureApp#redirect_url方法返回未经验证的HTTP Referer标头，可能导致开放重定向。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
heartcombo devise < 5.0.4 -

II. Public POCs for CVE-2026-40295

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-40295

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-40295 (1)

Vendor Advisories for CVE-2026-40295 (1)

IV. Related Vulnerabilities

Same product: devise
Same vendor: heartcombo
Same weakness: CWE-601

V. Comments for CVE-2026-40295

No comments yet

Leave a comment