CVE-2026-44511
Katalyst Koi: Session cookies can be replayed after user logout
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-613 |
| Vendor | katalyst |
| Product | koi |
| Published | May 14, 2026 |
| Last Updated | May 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
katalyst / koi
< 4.20.0 >= 5.0.0 <= 5.6.0