Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validated

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-86466
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 10:16:54 UTC
Updated2026-09-16 10:16:54 UTC
DescriptionApache 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.

Risk And Classification

Problem Types: CWE-346 | CWE-346 CWE-346: Origin Validation Error

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Airflow FAB Provider affected 3.9.0 semver Not specified

References

ReferenceSourceLinkTags
www.cve.org/CVERecord [email protected] www.cve.org
lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7 [email protected] lists.apache.org
github.com/apache/airflow/pull/72645 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Ritik Chaddha & NEO by ProjectDiscovery (en)

CNA: Jarek Potiuk (en)

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