Critical [CVE-2026-59243] Apache Airflow FAB provider: FAB auth manager: JWT signature verification disabled by default for Azure AD OAuth (`verify_signature` defaults to `False`)
This critical-severity Apache Software Foundation advisory covers CVE-2026-59243.
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Summary
The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=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 `verify_signature=True`.
Affected product named by the advisory: Apache Airflow FAB provider.
- Apache Airflow FAB provider before 3.7.3
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
Mitigation checklist
- Users are advised to upgrade to `apache-airflow-providers-fab` 3.7.3, which defaults `verify_signature=True`.
Official advisory · high-confidence parse· fetched 3 months ago·verify at source
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