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RubyGems package

katalyst-koi

Open actionable advisories and recorded vendor fixes. This public package view has no inventory attached and cannot establish whether your deployment is affected. A vendor fix never resolves your finding; verify your installed version and the source guidance.

Open advisories

1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. High, CVSS 7.4RubyGemsPublished

    katalyst-koi: Session cookies can be replayed after user logout

    CVE-2026-44511 · GHSA-4cx3-3c38-j9vv

    Affected
    • RubyGems katalyst-koi < 4.20.0; >= 5.0.0, < 5.6.0
    Fixed in
    5.6.04.20.0· Vendor fix available
    Issue
    Impact Admin session cookies were not invalidated when an admin user logged out. An attacker with access to a valid admin session cookie could continue to access admin functionality after logout, until the cookie expired or session secrets were rotated. This affects applications using Koi admin authentication where an admin session cookie may have been exposed, cached, intercepted, or otherwise retained after logout. Patches The issue has been patched by recording admin logout time and rejecting any admin session cookie created before the user’s most recent logout. Users should upgrade to the patched Koi releases once available. Workarounds Katalyst Koi recommends upgrading to the latest available version, or back porting the changes released in 5.6.0/4.20.0 Resources This is an application of https://guides.rubyonrails.org/v5.2.0/security.html#replay-attacks-for-cookiestore-sessions

    Recommended action: Upgrade to 5.6.0 or 4.20.0 by release line, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:github.comSource checked Evidence →