Description
Apache Airflow Keycloak provider: the unauthenticated token endpoint accepts a client-credentials grant for any confidential client registered in the Keycloak realm, not only the client configured for Airflow. No allowlist restricts which client ids may authenticate, so the credentials of an unrelated application that happens to share the realm are valid Airflow login credentials, and Airflow mints a signed session token for that application's service account. The endpoint also answers unauthenticated credential guesses against Keycloak under Airflow's identity.

Affects deployments using the Keycloak auth manager whose realm is shared with other confidential clients. The attacker needs valid credentials for any one of those clients, not for Airflow. Resource authorization is still evaluated per subject, so the access gained is whatever that service account holds, plus any endpoint gated only on being authenticated.

Users of apache-airflow-providers-keycloak are recommended to upgrade to version 0.10.0 or later, which accepts only the configured client on that grant.
Published: 2026-09-16
Score: 9.8 Critical
EPSS: < 1% Very Low
KEV: No
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Remediation

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History

Thu, 17 Sep 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache airflow Keycloak Provider
Vendors & Products Apache
Apache airflow Keycloak Provider

Thu, 17 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 16 Sep 2026 15:00:00 +0000


Wed, 16 Sep 2026 10:30:00 +0000

Type Values Removed Values Added
References

Wed, 16 Sep 2026 09:30:00 +0000

Type Values Removed Values Added
Description Apache Airflow Keycloak provider: the unauthenticated token endpoint accepts a client-credentials grant for any confidential client registered in the Keycloak realm, not only the client configured for Airflow. No allowlist restricts which client ids may authenticate, so the credentials of an unrelated application that happens to share the realm are valid Airflow login credentials, and Airflow mints a signed session token for that application's service account. The endpoint also answers unauthenticated credential guesses against Keycloak under Airflow's identity. Affects deployments using the Keycloak auth manager whose realm is shared with other confidential clients. The attacker needs valid credentials for any one of those clients, not for Airflow. Resource authorization is still evaluated per subject, so the access gained is whatever that service account holds, plus any endpoint gated only on being authenticated. Users of apache-airflow-providers-keycloak are recommended to upgrade to version 0.10.0 or later, which accepts only the configured client on that grant.
Title Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session JWT
Weaknesses CWE-287
References

Subscriptions

Apache Airflow Keycloak Provider
cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-09-17T19:21:54.927Z

Reserved: 2026-08-19T10:41:32.293Z

Link: CVE-2026-76187

cve-icon Vulnrichment

Updated: 2026-09-16T09:12:58.283Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-09-16T10:16:52.910

Modified: 2026-09-17T20:18:15.083

Link: CVE-2026-76187

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-17T20:50:09Z

Weaknesses