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CVE-2026-86466

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

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-86466

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86466

Published

apache-airflow-providers-fab

https://pypi.python.org

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/apache-airflow-providers-fab",
                    "product": "Apache Airflow FAB provider",
                    "vendor": "Apache Software Foundation",
                    "versions": [
                        {
                            "lessThan": "3.9.0",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        }
                    ],
                    "collectionURL": "https://pypi.python.org",
                    "packageName": "apache-airflow-providers-fab"
                }

Original source record · Cite this exact observation · Complete original publisher JSON