GHSA-4cx3-3c38-j9vv

Source

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

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4cx3-3c38-j9vv/GHSA-4cx3-3c38-j9vv.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-4cx3-3c38-j9vv

Aliases

CVE-2026-44511

Published

2026-05-07T02:13:42Z

Modified

2026-05-14T21:00:19.549173851Z

Severity

7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

katalyst-koi: Session cookies can be replayed after user logout

Details

Impact

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 affects applications using Koi admin authentication where an admin session cookie may have been exposed, cached, intercepted, or otherwise retained after logout.

Patches

The issue has been patched by recording admin logout time and rejecting any admin session cookie created before the user’s most recent logout.

Users should upgrade to the patched Koi releases once available.

Workarounds

Katalyst Koi recommends upgrading to the latest available version, or back porting the changes released in 5.6.0/4.20.0

Resources

This is an application of https://guides.rubyonrails.org/v5.2.0/security.html#replay-attacks-for-cookiestore-sessions

Database specific

{
    "github_reviewed_at": "2026-05-07T02:13:42Z",
    "cwe_ids": [
        "CWE-613"
    ],
    "github_reviewed": true,
    "severity": "HIGH",
    "nvd_published_at": "2026-05-14T17:16:22Z"
}

References

Affected packages

RubyGems / katalyst-koi

Package

Name: katalyst-koi
Purl: pkg:gem/katalyst-koi

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

4.20.0

Affected versions

4.*

4.0.0

4.0.1

4.0.2

4.0.3

4.1.0

4.1.1

4.1.2

4.2.0.beta.1

4.2.0.beta.2

4.2.0

4.2.1

4.3.0.beta.2

4.3.0.beta.3

4.3.0

4.3.1

4.3.2

4.3.3

4.3.4

4.3.5

4.4.0

4.4.1

4.5.0.beta.1

4.5.0.beta.2

4.5.0

4.5.1

4.5.2

4.5.3

4.5.4

4.5.5

4.5.6

4.5.7

4.5.8

4.5.9

4.6.0

4.7.0

4.7.1

4.7.2

4.7.3

4.8.0

4.8.1

4.9.0

4.9.1

4.9.2

4.9.3

4.9.4

4.9.5

4.10.0

4.10.1

4.10.2

4.10.3

4.11.0

4.11.1

4.11.2

4.12.0

4.12.1

4.12.2

4.12.3

4.12.4

4.12.5

4.12.6

4.13.0

4.13.2

4.14.0

4.14.1

4.14.2

4.14.3

4.15.0

4.15.1

4.16.0

4.17.0

4.17.1

4.18.0

4.18.1

4.19.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4cx3-3c38-j9vv/GHSA-4cx3-3c38-j9vv.json"

RubyGems / katalyst-koi

Package

Name: katalyst-koi
Purl: pkg:gem/katalyst-koi

Affected ranges

Type: ECOSYSTEM
Events: Introduced

5.0.0

Fixed

5.6.0

Affected versions

5.*

5.0.0

5.0.1

5.0.2

5.0.3

5.1.0

5.2.0

5.3.0

5.3.1

5.4.0

5.5.0

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-4cx3-3c38-j9vv/GHSA-4cx3-3c38-j9vv.json"