{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:redhat:build_of_keycloak:26.5.2:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "26.5.2"
              },
              {
                "last_affected": "26.5.2"
              }
            ],
            "source": "CPE_STRING"
          },
          "events": [
            {
              "introduced": "4c5b05789e16ec963e9477ce1f58118ca89c4d6e"
            },
            {
              "last_affected": "4c5b05789e16ec963e9477ce1f58118ca89c4d6e"
            }
          ],
          "repo": "https://github.com/keycloak/keycloak",
          "type": "GIT"
        }
      ],
      "versions": [
        "26.5.2"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "redhat",
    "cwe_ids": [
      "CWE-284"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1609.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "26.5.0"
          },
          {
            "fixed": "26.5.3"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.",
  "id": "CVE-2026-1609",
  "modified": "2026-08-12T03:51:22.291661622Z",
  "published": "2026-07-16T00:26:10.772Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/releases/tag/26.5.3"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-1609"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/1xxx/CVE-2026-1609.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1609"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2435257"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/keycloak/keycloak/issues/46144"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users"
}