CVE-2026-44511

Katalyst Koi: Session cookies can be replayed after user logout

State: Published
Severity: 7.4 High
Published: May 14, 2026
Updated: May 14, 2026
Reserved: May 6, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-613 Insufficient Session Expiration

Affected Products

Product	Versions
koikatalyst	< 4.20.0Affected >= 5.0.0 <= 5.6.0Affected

References

https://github.com/katalyst/koi/security/advisories/GHSA-4cx3-3c38-j9vv

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