GHSA-RG35-5V25-MQVP

Vulnerability from github – Published: 2025-10-28 15:30 – Updated: 2025-12-20 05:40
VLAI
Summary
Keycloak vulnerable to session takeovers due to reuse of session identifiers
Details

A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user's session if both use the same device and browser. This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing. As a result, one user may receive tokens that belong to another user.

Severity
6.0 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-services"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-12390"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-384"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-29T15:35:45Z",
    "nvd_published_at": "2025-10-28T14:15:57Z",
    "severity": "MODERATE"
  },
  "details": "A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user\u0027s session if both use the same device and browser. This happens because Keycloak sometimes reuses session identifiers and doesn\u2019t clean up properly during logout when browser cookies are missing. As a result, one user may receive tokens that belong to another user.",
  "id": "GHSA-rg35-5v25-mqvp",
  "modified": "2025-12-20T05:40:24Z",
  "published": "2025-10-28T15:30:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-12390"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/32197"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/43853"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/5344aada5ee06b02ec3a9e0f52fa381d085b6282"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/b46fab230824a2304daafe74be019e8bd4ee590a"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/d82438a611f2f869f1966c13012953fe963a493d"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/commit/ef75a4dc50aa9459777494e4b88655100bf2ac80"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:21370"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:21371"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:22088"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:22089"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2025-12390"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2406793"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keycloak/keycloak"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/discussions/31265"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keycloak vulnerable to session takeovers due to reuse of session identifiers"
}



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