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9.8
CVE-2026-76187: Apache Airflow Keycloak provider lets other apps log in
CVE-2026-76187 · published 9 days ago
Summary
If your Airflow installation uses the Keycloak authentication manager and shares the Keycloak realm with other applications, any of those applications can use its own client credentials to obtain a valid Airflow login token. This means an attacker who has credentials for a different service in the same realm could appear as an authenticated Airflow user and act with whatever permissions that service account has. Upgrade the Apache Airflow Keycloak provider to version 0.10.0 or newer, which restricts logins to the specific Airflow client only.
What to do
- Update apache software foundation apache airflow keycloak provider to version 0.10.0 or later.
- Update apache apache-airflow-providers-keycloak to version 0.10.0 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| apache software foundation | apache airflow keycloak provider | < 0.10.0 |
| apache | apache-airflow-providers-keycloak |
< 0.10.0 cpe:2.3:a:apache:apache-airflow-providers-keycloak:*:*:*:*:*:*:*:* |
Original advisory text
Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session JWT
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.
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.
References
- https://github.com/apache/airflow/pull/72205 Patch
- https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3 Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/09/15/9 URL
- https://lists.apache.org/thread/[email protected]... Vendor Advisory
- https://pypi.python.org URL
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76187... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-76187 Vendor Advisory
Severity
9.8
Critical
Exploitation
EPSS <1%
Type
CWE-287Improper Authentication
Timeline
Published16 Sep 2026
Updated25 Sep 2026
First seen16 Sep 2026
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