CVE-2026-75156 Auth bypass in Apache Airflow FAB provider
Attackers can bypass authentication in Apache Airflow by using tokens from any Azure tenant, gaining unauthorized access to the UI.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-75156?
CVE-2026-75156 is a critical authentication bypass vulnerability in Apache Airflow FAB provider, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Apache Airflow FAB provider versions 3.7.3 through 3.8.0 do not validate the issuer or audience of Azure AD `id_token`s during OAuth login. Deployments are affected only when the FAB auth manager is configured with Azure AD as an OAuth provider. Because the signing keys are fetched from Microsoft's **multi-tenant** JWKS endpoint, an `id_token` minted in *any* Azure tenant — including one the attacker creates — passes signature verification, and the username and role assignments are then read from that attacker-controlled token. Anyone able to register an Azure tenant can therefore authenticate to the Airflow UI with no prior access to the deployment.
The fix for **CVE-2026-59243** was incomplete, and this advisory closes the remaining gap: that fix made the provider verify the `id_token` signature, but did not add issuer or audience checks. Operators who already applied the CVE-2026-59243 fix are **still affected and must upgrade again** — 3.7.3 is the release that shipped that fix, so every version containing it falls inside this affected range. Upgrade to apache-airflow-providers-fab `3.8.1` or later.
Weakness: CWE-346
Which versions are affected by CVE-2026-75156?
It affects 1 product.
Products include Apache Apache-Airflow-Providers-Fab.
How do I fix CVE-2026-75156?
Upgrade to a fixed version.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-75156 being exploited?
There is no known exploitation of CVE-2026-75156 in the wild and no public exploit code.
Other vulnerabilities in Apache Airflow FAB provider
- CVE-2026-82311 Security feature bypass in Apache Airflow FAB provider
- CVE-2026-59243 Auth bypass in Apache Airflow FAB provider
- CVE-2024-42447 Apache Airflow Providers FAB: FAB provider 1.2.1 and 1.2.0 did not let user to logout for Airflow
- CVE-2026-86462 Apache Airflow FAB provider: FAB Admin password PATCH does not invalidate database-backed sessions
- CVE-2026-86466 Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validated
Sources
Also known as CLEANSTART-2026-TQ94718, GHSA-vrqc-p75r-25rv.