---
title: "CVE-2026-86466: Apache Airflow FAB provider - Authentication Bypass"
description: "Apache Airflow FAB provider contains an authentication bypass caused by missing validation of issuer and audience claims in the Authentik OAuth path, letting attackers with valid tokens for other applications authenticate as arbitrary users, exploit requires attacker to have a valid token for another application."
url: https://panop.io/threat-heartbeat/CVE-2026-86466/
---

# CVE-2026-86466 Apache Airflow FAB provider - Authentication Bypass

Apache Airflow FAB provider contains an authentication bypass caused by missing validation of issuer and audience claims in the Authentik OAuth path, letting attackers with valid tokens for other applications authenticate as arbitrary users, exploit requires attacker to have a valid token for another application.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.37% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-86466)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-346](https://cwe.mitre.org/data/definitions/346.html)

## Vendor fix

Upgrade to version 3.9.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-86466](https://nvd.nist.gov/vuln/detail/CVE-2026-86466)
- [https://github.com/apache/airflow/pull/72645](https://github.com/apache/airflow/pull/72645)
- [https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7](https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7)
- [https://www.cve.org/CVERecord?id=CVE-2026-75156](https://www.cve.org/CVERecord?id=CVE-2026-75156)
- [https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7?users@airflow.apache.org](https://lists.apache.org/thread/qh7fobs16p2hgln2yblbgf8ty4dvf4y7?users@airflow.apache.org)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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