CVE-2026-44511 json
Katalyst Koi: Session cookies can be replayed after user logout
published 2026-05-07 6 mo ago modified 2026-10-26 14 d ago also GHSA-4cx3-3c38-j9vv , EUVD-2026-30329
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 9%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- rubygems katalyst-koi 4.20.0, 5.6.0
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 9% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| rubygems | katalyst-koi | <4.20.0 >=5.0.0, <5.6.0 |
4.20.0 5.6.0 |
Affected products
- katalyst koi
Classification
- Weakness
-
- CWE-613 DEPRECATED: Insufficient Session Expiration
References
-
github.com
/katalyst/koi/security/advisories/GHSA-4cx3-3c38-j9vv
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-44511
advisory
-
github.com
/katalyst/koi
package
-
github.com
/rubysec/ruby-advisory-db/blob/master/gems/katalyst-koi/CVE-2026-44511.yml
web
-
guides.rubyonrails.org
/v5.2.0/security.html#replay-attacks-for-cookiestore-sessions
web
Sources
- CVE List CVE-2026-44511
- GitHub Advisory GHSA-4cx3-3c38-j9vv
- NVD CVE-2026-44511
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