Description
A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-services component of Red Hat Build of Keycloak. This component handles various OAuth2 and OpenID Connect grant types used for issuing access tokens. The issue occurs because the JWT Bearer grant fails to check if a client requires user consent before issuing a token. This allows an authenticated attacker with valid client credentials and a trusted identity provider assertion to bypass the consent requirement and obtain unauthorized access to a user account at a consent-gated client.
Published: 2026-08-25
Score: 5.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A flaw exists in the JWT Bearer authorization grant inside the keycloak-services component of Red Hat Build of Keycloak. The grant does not verify that a client has a user consent requirement before issuing a token. Consequently, an authenticated attacker who possesses valid client credentials and a trusted identity‑provider assertion can obtain a token that grants access to a user account at a client that normally requires consent.

Affected Systems

The vulnerability affects the keycloak-services component of Red Hat Build of Keycloak and is also present in Red Hat Single Sign‑On 7. No specific product versions are listed; the issue is documented for the Red Hat Build of Keycloak and RHEL SSO 7 packages.

Risk and Exploitability

The CVSS score of 5.9 indicates moderate severity, and the EPSS score is not available; the vulnerability is not listed in the CISA KEV catalog. Attackers need to be authenticated and possess valid client credentials, and must be able to present a trusted identity‑provider assertion. If an attacker can meet these prerequisites, they can bypass the consent requirement and acquire a token that provides unauthorized access to a user account at a consent‑gated client. The risk is therefore moderate, contingent on the attacker’s ability to obtain suitable client credentials and a trusted assertion.

Generated by OpenCVE AI on August 25, 2026 at 12:30 UTC.

Remediation

Vendor Workaround

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.


OpenCVE Recommended Actions

  • Disable the JWT Bearer grant in environments where it is not required
  • Apply the latest Red Hat updates when a vendor patch becomes available
  • Audit client configurations to ensure consent requirements are enforced and monitor for abnormal token issuance

Generated by OpenCVE AI on August 25, 2026 at 12:30 UTC.

Tracking

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Advisories

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History

Tue, 25 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 25 Aug 2026 11:15:00 +0000

Type Values Removed Values Added
Description A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-services component of Red Hat Build of Keycloak. This component handles various OAuth2 and OpenID Connect grant types used for issuing access tokens. The issue occurs because the JWT Bearer grant fails to check if a client requires user consent before issuing a token. This allows an authenticated attacker with valid client credentials and a trusted identity provider assertion to bypass the consent requirement and obtain unauthorized access to a user account at a consent-gated client.
Title Keycloak-services: keycloak-services: jwt bearer authorization grant does not enforce consentrequired
First Time appeared Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
Weaknesses CWE-862
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N'}


Subscriptions

Redhat Build Keycloak Red Hat Single Sign On
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-25T11:07:48.988Z

Reserved: 2026-08-25T10:42:40.677Z

Link: CVE-2026-79652

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-25T11:16:54.850

Modified: 2026-08-25T11:16:54.850

Link: CVE-2026-79652

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-08-18T07:58:43Z

Links: CVE-2026-79652 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T12:30:17Z

Weaknesses