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This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.
Description
A flaw was found in Keycloak. An authenticated user with low privileges can exploit this vulnerability by sending an oversized subject_token JSON Web Token (JWT) to the TokenEndpoint. When the token exceeds a 4000-character limit, it is silently dropped, causing the system to fall back to client credentials. This allows the user to gain the permissions of the client's service account, leading to privilege escalation.
Metrics
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[{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-operator-bundle","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6.3-3","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-6","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9-operator","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-6","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6.3","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhbk/keycloak-rhel9","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"]}]
CVE Modified by Red Hat, Inc.6/25/2026 7:17:04 PM
Action
Type
Old Value
New Value
Changed
Affected
[{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-operator-bundle","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6.3-3","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-6","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9-operator","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-6","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6.3","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhbk/keycloak-rhel9","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"]}]
[{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-operator-bundle","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6.3-3","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-6","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9-operator","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-6","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"keycloak-rhel9-container","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-8","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"keycloak-rhel9-operator-container","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6-8","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.6","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-operator-bundle","cpes":["cpe:/a:redhat:build_keycloak:26.6::el9"],"versions":[{"version":"26.6.4-2","lessThan":"*","versionType":"rpm","status":"unaffe
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CVE Modified by Red Hat, Inc.6/10/2026 6:17:03 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:25097
CVE Modified by Red Hat, Inc.6/10/2026 2:17:15 PM
Action
Type
Old Value
New Value
Added
Reference
https://access.redhat.com/errata/RHSA-2026:25098
Initial Analysis by NIST6/03/2026 11:40:29 AM
Action
Type
Old Value
New Value
Added
CVSS V3.1
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added
CPE Configuration
OR
*cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*
Added
Reference Type
Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-9704 Types: Mitigation, Vendor Advisory
Added
Reference Type
Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2481877 Types: Issue Tracking, Vendor Advisory
New CVE Received from Red Hat, Inc.5/27/2026 10:17:40 AM
Action
Type
Old Value
New Value
Added
Description
A flaw was found in Keycloak. An authenticated user with low privileges can exploit this vulnerability by sending an oversized subject_token JSON Web Token (JWT) to the TokenEndpoint. When the token exceeds a 4000-character limit, it is silently dropped, causing the system to fall back to client credentials. This allows the user to gain the permissions of the client's service account, leading to privilege escalation.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
