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High · 7.4 CVE-2026-44511 EUVD-2026-30329GHSA-4cx3-3c38-j9vv

Katalyst Koi: Session cookies can be replayed after user logout

Published May 14, 2026 · Updated May 14, 2026 · Assigned by GitHub_M

Description

Katalyst Koi is a framework for building Rails admin functionality. Prior to 4.20.0 and 5.6.0, 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 vulnerability is fixed in 4.20.0 and 5.6.0.

Affected products

VendorProductAffectedFixed
katalyst koi < 4.20.0, >= 5.0.0 <= 5.6.0 —

Affected packages

EcosystemPackageAffectedFixedRecord
RubyGems katalyst-koi < 4.20.0 4.20.0 GHSA-4cx3-3c38-j9vv
RubyGems katalyst-koi >= 5.0.0, < 5.6.0 5.6.0 GHSA-4cx3-3c38-j9vv

References