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.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-4cx3-3c38-j9vv katalyst-koi: Session cookies can be replayed after user logout
Fixes

Solution

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Workaround

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History

Thu, 14 May 2026 17:00:00 +0000

Type Values Removed Values Added
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.
Title Katalyst Koi: Session cookies can be replayed after user logout
Weaknesses CWE-613
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-14T18:34:47.908Z

Reserved: 2026-05-06T18:28:20.887Z

Link: CVE-2026-44511

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-05-14T17:16:22.760

Modified: 2026-05-14T18:19:25.260

Link: CVE-2026-44511

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses