Devise has an Open Redirect via Unvalidated `request.referrer` in Timeoutable Session Timeout Handler

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0024, the 15th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 15:16 UTC First seen by agentprime
2. 31 Oct 2026, 15:16 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-jp94-3292-c3xv
• OSV: GHSA-jp94-3292-c3xv
• github.com/heartcombo/devise/security/advisories/GHSA-jp94-3292-c3xv
• nvd.nist.gov/vuln/detail/CVE-2026-40295
• github.com/heartcombo/devise/commit/025fe2124f9928766fc46520e999633b598d0360
• github.com/heartcombo/devise
• github.com/rubysec/ruby-advisory-db/blob/master/gems/devise/CVE-2026-40295.yml

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.