CVE-2026-86466
Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validated
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.
INFO
Published Date :
Sept. 16, 2026, 10:16 a.m.
Last Modified :
Sept. 18, 2026, 2:29 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Upgrade apache-airflow-providers-fab to version 3.9.0 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-86466.
| URL | Resource |
|---|---|
| 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 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-86466 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-86466
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-86466 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-86466 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 18, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:* versions up to (excluding) 3.9.0 Added Reference Type Apache Software Foundation: https://github.com/apache/airflow/pull/72645 Types: Patch, Vendor Advisory Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7 Types: Mailing List, Vendor Advisory Added Reference Type Apache Software Foundation: https://lists.apache.org/thread/[email protected] Types: Mailing List, Vendor Advisory Added Reference Type Apache Software Foundation: https://www.cve.org/CVERecord?id=CVE-2026-75156 Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 17, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Added SSVC {'id': 'CVE-2026-86466', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-09-17T19:20:37.232025Z'} -
CVE Modified by [email protected]
Sep. 16, 2026
Action Type Old Value New Value Added Reference https://lists.apache.org/thread/[email protected] -
New CVE Received by [email protected]
Sep. 16, 2026
Action Type Old Value New Value Added 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. Added CWE CWE-346 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/86xxx/CVE-2026-86466.json">CVE-2026-86466</a> Added Reference https://github.com/apache/airflow/pull/72645 Added Reference https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7 Added Reference https://www.cve.org/CVERecord?id=CVE-2026-75156