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CVE-2026-44511 — Vulnerability in katalyst-koi — CVE Details

HIGH

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

Published May 7, 2026Updated May 29, 2026Source: osv

Summary

### 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

Advisory Timeline

  • First published May 7, 2026 (158 days ago).
  • Last revised May 29, 2026 — 23 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update katalyst-koi to 4.20.0 or later
gem install katalyst-koi -v 4.20.0
Bundler
Update katalyst-koi to 5.6.0 or later
gem install katalyst-koi -v 5.6.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
katalyst-koi
rubygems
4.0.0, 4.0.1, 4.0.2, 4.0.3 (+70 more)4.20.0
katalyst-koi
rubygems
5.0.0, 5.0.1, 5.0.2, 5.0.3 (+6 more)5.6.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.4 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-44511?
katalyst-koi: Session cookies can be replayed after user logout This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.4/10).
How do I check if my project is affected by CVE-2026-44511?
CVE-2026-44511 affects katalyst-koi. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-44511 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.4

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-4cx3-3c38-j9vv

Related CVEs

  • CVE-2026-94462
    HIGH

    Spree: Broken Access Control in `PATCH /api/v3/store/carts/:id/associate` (IDOR)

  • CVE-2026-77601
    HIGH

    OpenC3 COSMOS: Authenticated OS command injection via the `pypi_url` setting

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