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CVE-2026-86466— Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validated

Quick assessment

Affected
Apache Software Foundation Apache Airflow FAB 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 FAB provider: the Authentik OAuth path in the FAB auth manager does not validate the issuer or audience claims of the id_token it accepts. An attacker holding a token that the same Authentik identity provider minted for a different client applic

AI Predicted 8.1 Difficulty: Easy
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I. Basic Information for CVE-2026-86466

Vulnerability Information

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Vulnerability Title
Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validated
Source: CVE Program / CVE List V5
Vulnerability Description
Apache Airflow FAB provider: the Authentik OAuth path in the FAB auth manager does not validate the issuer or audience claims of the id_token it accepts. An attacker holding a token that the same Authentik identity provider minted for a different client application can present it to Airflow and be authenticated as the user it names, because the audience claim is never checked. Affects deployments using the FAB auth manager with Authentik OAuth where the same Authentik instance also serves other applications; the attacker needs a valid token for any of those other applications, not for Airflow. CVE-2026-75156 corrected the same missing validation on the Azure AD path in this file; the Authentik path was left unchanged and is fixed here. Deployments that applied the CVE-2026-75156 fix and use Authentik must also upgrade for this one. Users of apache-airflow-providers-fab are recommended to upgrade to version 3.9.0 or later, which fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Airflow FAB provider 0 ~ 3.9.0 -

II. Public POCs for CVE-2026-86466

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III. Intelligence Information for CVE-2026-86466

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Patches & Fixes for CVE-2026-86466 (1)

Mailing List Discussions for CVE-2026-86466 (1)

Other References for CVE-2026-86466 (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-2026-76187 Apache Airflow Keycloak provider: Any realm client's credentials mint an Airflow session J
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 FAB provider
Same vendor: Apache Software Foundation
Same weakness: CWE-346

V. Comments for CVE-2026-86466

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