Keycloak-services: keycloak-services: injection of roles into realm default-roles via dcr endpoint

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-109081
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-06 06:16:39 UTC
Updated2026-11-06 18:17:43 UTC
DescriptionA flaw was found in Keycloak. The Dynamic Client Registration (DCR) endpoint does not properly validate authorization when processing the deprecated defaultRoles field. An authenticated attacker with client creation privileges or an Initial Access Token (IAT) can inject excessive roles into the realm's default roles configuration. This causes clients across the realm to generate bloated access tokens, resulting in performance and memory degradation that can lead to a Denial of Service (DoS).

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

Problem Types: CWE-862 | CWE-862 Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H
3.1CNACVSS6.8MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Build Of Keycloak 26.6 unaffected 26.6.8-2 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.6 unaffected 26.6-24 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.6 unaffected 26.6-24 * rpm Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.6.8 Not specified Not specified
CNA Red Hat Red Hat Build Of Keycloak 26.6.8 Not specified Not specified
CNA Red Hat Red Hat Single Sign-On 7 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:95761 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-109081 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:95762 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-10-09T18:28:55.000ZReported to Red Hat.
CNA2026-11-05T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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