---
title: "CVE-2026-76187: Apache Airflow - Authentication Bypass"
description: "Apache Airflow Keycloak provider contains an authentication bypass caused by unauthenticated token endpoint accepting any confidential client credentials in a shared Keycloak realm, letting attackers authenticate as any client, exploit requires valid credentials of any confidential client in the realm."
url: https://panop.io/threat-heartbeat/CVE-2026-76187/
---

# CVE-2026-76187 Apache Airflow - Authentication Bypass

Apache Airflow Keycloak provider contains an authentication bypass caused by unauthenticated token endpoint accepting any confidential client credentials in a shared Keycloak realm, letting attackers authenticate as any client, exploit requires valid credentials of any confidential client in the realm.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.98% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-76187)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

16 September 2026

Updated

15 October 2026

Weakness

[CWE-287](https://cwe.mitre.org/data/definitions/287.html)

## Vendor fix

Upgrade apache-airflow-providers-keycloak to version 0.10.0 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-2026-76187](https://nvd.nist.gov/vuln/detail/CVE-2026-76187)
- [https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3](https://lists.apache.org/thread/5cqh5ojl3718ogb0q1dcd9vdr47z7gp3)
- [http://www.openwall.com/lists/oss-security/2026/09/15/9](http://www.openwall.com/lists/oss-security/2026/09/15/9)
- [https://lists.apache.org/thread/j1b9ddljxphqvoc41z7gthj4zh34vmlw?users@airflow.apache.org](https://lists.apache.org/thread/j1b9ddljxphqvoc41z7gthj4zh34vmlw?users@airflow.apache.org)
- [https://github.com/apache/airflow/pull/72205](https://github.com/apache/airflow/pull/72205)

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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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