{
  "threat_severity" : "Important",
  "public_date" : "2026-05-29T00:00:00Z",
  "bugzilla" : {
    "description" : "org.keycloak:keycloak-services: Keycloak: Authentication bypass via JWT algorithm confusion",
    "id" : "2487006",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2487006"
  },
  "cvss3" : {
    "cvss3_base_score" : "8.1",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
    "status" : "verified"
  },
  "cwe" : "CWE-347",
  "details" : [ "A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.", "A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation." ],
  "acknowledgement" : "Red Hat would like to thank Bilal Teke for reporting this issue.",
  "affected_release" : [ {
    "product_name" : "Red Hat build of Keycloak 26.6",
    "release_date" : "2026-06-25T00:00:00Z",
    "advisory" : "RHSA-2026:30084",
    "cpe" : "cpe:/a:redhat:build_keycloak:26.6::el9",
    "package" : "rhbk/keycloak-operator-bundle:26.6.4-2"
  }, {
    "product_name" : "Red Hat build of Keycloak 26.6",
    "release_date" : "2026-06-25T00:00:00Z",
    "advisory" : "RHSA-2026:30084",
    "cpe" : "cpe:/a:redhat:build_keycloak:26.6::el9",
    "package" : "rhbk/keycloak-rhel9:26.6-8"
  }, {
    "product_name" : "Red Hat build of Keycloak 26.6",
    "release_date" : "2026-06-25T00:00:00Z",
    "advisory" : "RHSA-2026:30084",
    "cpe" : "cpe:/a:redhat:build_keycloak:26.6::el9",
    "package" : "rhbk/keycloak-rhel9-operator:26.6-8"
  }, {
    "product_name" : "Red Hat build of Keycloak 26.6.4",
    "release_date" : "2026-06-25T00:00:00Z",
    "advisory" : "RHSA-2026:30083",
    "cpe" : "cpe:/a:redhat:build_keycloak:26.6::el9"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Build of Keycloak",
    "fix_state" : "Affected",
    "package_name" : "rhbk/keycloak-rhel9",
    "cpe" : "cpe:/a:redhat:build_keycloak:"
  }, {
    "product_name" : "Red Hat Build of Keycloak",
    "fix_state" : "Not affected",
    "package_name" : "rhbk-openshift-rhel9/rhbk-openshift-rhel9",
    "cpe" : "cpe:/a:redhat:build_keycloak:"
  }, {
    "product_name" : "Red Hat Data Grid 8",
    "fix_state" : "Not affected",
    "package_name" : "keycloak-services",
    "cpe" : "cpe:/a:redhat:jboss_data_grid:8"
  }, {
    "product_name" : "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "fix_state" : "Not affected",
    "package_name" : "keycloak-services",
    "cpe" : "cpe:/a:redhat:jbosseapxp"
  }, {
    "product_name" : "Red Hat Single Sign-On 7",
    "fix_state" : "Not affected",
    "package_name" : "keycloak-services",
    "cpe" : "cpe:/a:redhat:red_hat_single_sign_on:7"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-11800\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-11800" ],
  "name" : "CVE-2026-11800",
  "csaw" : false
}