GHSA-jp94-3292-c3xv · 深刻度： medium · エコシステム： rubygems — Devise has an Open Redirect via Unvalidated `request.referrer` in Timeoutable Session Timeout Handler
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.
総合評価: CVE-2026-40295 は低リスク（29.6/100）。CVSS 深刻度は中。悪用される可能性が高い（EPSS 0.24%、15 パーセンタイル） 推奨対応: 悪用情報と EPSS の推移を監視し、必要に応じて優先度を見直してください。
リスクは変動します。再評価に基づき、本ページの表示内容を更新しています。
EPSS は日次で悪用されやすさの相対度合いを推定します。パーセンタイルは採点済み CVE の中での相対位置（高いほど相対的に深刻）を示します。
| # | 日付 | 旧 EPSS スコア | 新 EPSS スコア | Δ（新 − 旧） |
|---|---|---|---|---|
| 1 | 2026-06-23 | 0.32% | 0.24% | -0.08% |
| 2 | 2026-06-15 | 0.05% | 0.32% | +0.27% |
| 3 | 2026-05-23 | — | 0.05% | — |
EPSS の全履歴 （全 3 件）
この CVE の CVSS 指標。
| ベーススコア | バージョン | 深刻度 | ベクトル | 悪用しやすさ | 影響 | スコアの出典 |
|---|---|---|---|---|---|---|
| 6.1 | 3.1 | MEDIUM |
|
2.8 | 2.7 | [email protected] |
GHSA-jp94-3292-c3xv · 深刻度： medium · エコシステム： rubygems — Devise has an Open Redirect via Unvalidated `request.referrer` in Timeoutable Session Timeout Handler
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-40295 not yet assigned priority: Debian including 1 source packages (ruby-devise), 2 status rows across 2 suites (bookworm, bullseye): open 2. | https://security-tracker.debian.org/tracker/CVE-2026-40295 |
ubuntu
|
medium | CVE-2026-40295 medium priority: Ubuntu including 1 source packages (ruby-devise), 7 status rows across 7 suites (bionic, focal, jammy, noble, questing, resolute, upstream): needs-triage 5, DNE 2. | https://ubuntu.com/security/CVE-2026-40295 |
| ベンダー | 製品 | バージョン | 生の CPE |
|---|---|---|---|
| heartcombo | devise | < 5.0.4 | cpe:2.3:a:heartcombo:devise:*:*:*:*:*:ruby:*:* |
| URL | タグ |
|---|---|
| https://github.com/heartcombo/devise/commit/025fe2124f9928766fc46520e999633b598d0360 | Patch |
| https://github.com/heartcombo/devise/security/advisories/GHSA-jp94-3292-c3xv | Mitigation Vendor Advisory |