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CVE-2026-59243

Apache Apache-airflow-providers-fab authentication bypass

9.8 CRITICALEPSS 0.64%
  1. Published29 Jul 2026

Description

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`.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Apache-airflow-providers-fab< 3.7.3

Remediation

Fixed in
Apache Apache-airflow-providers-fab≥ 3.7.3

References

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Frequently asked

Is CVE-2026-59243 being actively exploited?

CVE-2026-59243 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.64%.

How severe is CVE-2026-59243?

CVE-2026-59243 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.64% probability of exploitation.

Which products are affected by CVE-2026-59243?

Affected products include Apache Apache-airflow-providers-fab.

How do I fix CVE-2026-59243?

Upgrade affected software to a fixed version, for example Apache Apache-airflow-providers-fab 3.7.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.