The FAB auth manager's Azure AD OAuth login defaulted verifysignature=False when decoding the ID token, so an attacker able to present a forged or unsigned (alg:none) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments running the FAB auth manager with the Azure AD OAuth login path under its default configuration are affected; the Authentik path already defaulted to True. This issue affects apache-airflow-providers-fab before 3.7.3. Users are advised to upgrade to apache-airflow-providers-fab 3.7.3, which defaults verifysignature=True.

Apache Airflow FAB Auth Manager contains an LDAP filter injection vulnerability (CWE-90) that allows unauthenticated attackers to exfiltrate directory data or bypass authentication. Upgrade to apache-airflow-providers-fab 3.6.4 or later. If immediate upgrade is not possible, disable LDAP authentication until the provider can be updated.

Severity: Moderate

Affected versions:

- Apache Airflow FAB provider (apache-airflow-providers-fab) before 3.6.4

Description:

Apache Airflow FAB Auth Manager contains an LDAP filter injection vulnerability (CWE-90) that allows unauthenticated attackers to exfiltrate directory data or bypass authentication. Upgrade to apache-airflow-providers-fab 3.6.4 or later. If immediate upgrade is not possible, disable LDAP authentication until the provider can be updated.

Credit:

Venkatraman Kumar (r3dw0lfsec), Securin (finder) orbisai0security (automated scanner — Orbis Security AI) (remediation developer)

References:

https://github.com/apache/airflow/pull/66417 https://airflow.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-46745