CVE-2026-86466

8.1 HIGHpublic exploit available

Published 2026-09-16 · Updated 2026-09-18

AI risk analysis

Summary: The Authentik OAuth path in Apache Airflow FAB provider does not validate the issuer or audience claims of the id_token, allowing attackers to authenticate as a different user using a valid token from another application.
Exploitability: Exploitation is moderately hard as it requires an attacker to have a valid token for another application served by the same Authentik instance. Precondition is the use of Authentik OAuth in the FAB auth manager.
Blast radius: If exploited, the attacker can authenticate as any user, potentially leading to unauthorized access and data breaches.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to apache-airflow-providers-fab version 3.9.0 or later.

auth-bypassweboauthapacheairflow

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-346

Vendors

apache

Products

apache-airflow-providers-fab

Public exploit & PoC references

https://github.com/apache/airflow/pull/72645 Patch, Vendor Advisory

References

https://github.com/apache/airflow/pull/72645 Patch, Vendor Advisory
https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7 Mailing List, Vendor Advisory
https://lists.apache.org/thread/[email protected] Mailing List, Vendor Advisory
https://www.cve.org/CVERecord?id=CVE-2026-75156 Third Party Advisory

Data: NVD (public domain). Analysis: local $0 model. Defensive use only.