Open Redirect The advisory has been revoked - it doesn't affect any version of package gitlab-rails-ce-18.1  (opens in a new tab)


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EPSS
0.24% (16th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-GITLABRAILSCE181-16620291
  • published10 May 2026
  • disclosed22 May 2026

Introduced: 10 May 2026

CVE-2026-40295  (opens in a new tab)
CWE-601  (opens in a new tab)

Amendment

The Chainguard security team deemed this advisory irrelevant for Chainguard:latest.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gitlab-rails-ce-18.1 package and not the gitlab-rails-ce-18.1 package as distributed by Chainguard.

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.