{"schemaVersion":3,"id":"CVE-2026-1609","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"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.","dates":{"published":"2026-07-16T00:26:10.772Z","modified":"2026-08-10T12:05:51.935Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.1,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.1,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00562,"percentile":0.45609,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00562},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00562,"percentile":0.45609}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00562,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00562,"percentile":0.45609}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-284","name":"Improper Access Control","description":"The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.","type":"weakness","status":"Incomplete","abstraction":"Pillar","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/284.html"}],"affected":[{"vendor":"keycloak","product":"keycloak","name":"keycloak","label":"keycloak","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 26.5.0, < 26.5.3","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 26.5.0, < 26.5.3","eol":null,"hubHref":"/vendor/keycloak/keycloak"},{"vendor":"redhat","product":"build_of_keycloak","name":"build of keycloak","label":"build_of_keycloak","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"26.5.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"26.5.2","eol":null,"hubHref":"/vendor/redhat/build_of_keycloak"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-1609","label":"access.redhat.com/security/cve/CVE-2026-1609","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT","Vendor Advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2435257","label":"bugzilla.redhat.com/show_bug.cgi?id=2435257","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT","Vendor Advisory"]},{"url":"https://github.com/keycloak/keycloak/issues/46144","label":"github.com/keycloak/keycloak/issues/46144","hostname":"github.com","tags":["Issue Tracking"]},{"url":"https://github.com/keycloak/keycloak/releases/tag/26.5.3","label":"github.com/keycloak/keycloak/releases/tag/26.5.3","hostname":"github.com","tags":["Release Notes"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json","label":"security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1609.json","hostname":"security.access.redhat.com","tags":["X Sadp Csaf Vex","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-07-16T00:26:10.772Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-10T12:05:51.935Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":33,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T03:31:38.728Z","stale":false,"partial":false}}