Vulnerability-Lookup

GHSA-4CX3-3C38-J9VV

Vulnerability from github – Published: 2026-05-07 02:13 – Updated: 2026-05-14 20:53

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

Severity

7.4 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "katalyst-koi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.20.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "katalyst-koi"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.6.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-44511"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-613"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-07T02:13:42Z",
    "nvd_published_at": "2026-05-14T17:16:22Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nAdmin 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.\n\nThis affects applications using Koi admin authentication where an admin session cookie may have been exposed, cached, intercepted, or otherwise retained after logout.\n\n### Patches\n\nThe issue has been patched by recording admin logout time and rejecting any admin session cookie created before the user\u2019s most recent logout.\n\nUsers should upgrade to the patched Koi releases once available.\n\n### Workarounds\n\nKatalyst Koi recommends upgrading to the latest available version, or back porting the changes released in 5.6.0/4.20.0\n\n### Resources\n\nThis is an application of https://guides.rubyonrails.org/v5.2.0/security.html#replay-attacks-for-cookiestore-sessions",
  "id": "GHSA-4cx3-3c38-j9vv",
  "modified": "2026-05-14T20:53:47Z",
  "published": "2026-05-07T02:13:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/katalyst/koi/security/advisories/GHSA-4cx3-3c38-j9vv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44511"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/katalyst/koi"
    },
    {
      "type": "WEB",
      "url": "https://guides.rubyonrails.org/v5.2.0/security.html#replay-attacks-for-cookiestore-sessions"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "katalyst-koi: Session cookies can be replayed after user logout"
}

CVE-2026-44511 (GCVE-0-2026-44511)

Vulnerability from cvelistv5 – Published: 2026-05-14 16:17 – Updated: 2026-05-14 18:34

Title

Katalyst Koi: Session cookies can be replayed after user logout

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.

Severity

7.4 (High)


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

CWE

CWE-613 - Insufficient Session Expiration

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/katalyst/koi/security/advisori…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
katalyst	koi	Affected: < 4.20.0 Affected: >= 5.0.0 <= 5.6.0

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-44511",
                "options": [
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-14T18:33:52.395978Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
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          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
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      "problemTypes": [
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          "tags": [
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          "url": "https://github.com/katalyst/koi/security/advisories/GHSA-4cx3-3c38-j9vv"
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      "source": {
        "advisory": "GHSA-4cx3-3c38-j9vv",
        "discovery": "UNKNOWN"
      },
      "title": "Katalyst Koi: Session cookies can be replayed after user logout"
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  "cveMetadata": {
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    "dateReserved": "2026-05-06T18:28:20.887Z",
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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