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CVE-2026-76187— Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session JWT

Quick assessment

Affected
Apache Software Foundation Apache Airflow Keycloak provider
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 authen

AI Predicted 9.8 Difficulty: Easy
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I. Basic Information for CVE-2026-76187

Vulnerability Information

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Vulnerability Title
Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session JWT
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Airflow Keycloak provider 0 ~ 0.10.0 -

II. Public POCs for CVE-2026-76187

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III. Intelligence Information for CVE-2026-76187

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Patches & Fixes for CVE-2026-76187 (1)

Mailing List Discussions for CVE-2026-76187 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-16 · 13 CVEs total

CVE-2026-84501 Apache ZooKeeper: Operational log forgery via newline injection in EnsembleAuthenticationP
CVE-2026-84439 Apache ZooKeeper: Audit log injection via unsanitized output from multiple sources
CVE-2026-79993 Apache ZooKeeper: Missing ACL check on deleteContainer opcode allows unauthorized deletion
CVE-2026-59969 Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode
CVE-2026-59739 Apache ZooKeeper: Information disclosure via SetWatches reconnect replay
CVE-2026-86466 Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validate
CVE-2026-76186 Apache Airflow Keycloak provider: Keycloak token cookies not bound to Airflow session iden
CVE-2026-82310 Apache Airflow FAB provider: FAB auth manager: deactivated users retain and renew Core API
CVE-2026-86792 Apache Airflow Apache Kafka provider: Connection-editor remote code execution on the Sched
CVE-2026-86462 Apache Airflow FAB provider: FAB Admin password PATCH does not invalidate database-backed
CVE-2026-82311 Apache Airflow FAB provider: FAB password reset never invalidates sessions: string/int _us
CVE-2026-86465 Apache Airflow Akeyless provider: Akeyless secrets backend: team-scope guard bypass via us

IV. Related Vulnerabilities

Same product: Apache Airflow Keycloak provider
Same vendor: Apache Software Foundation
Same weakness: CWE-287

V. Comments for CVE-2026-76187

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