CRITICALVulnerability
CVE-2026-59243
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`.
Properties
- severity
- CRITICAL
- score
- 9.8
- cve_id
- CVE-2026-59243
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- published_at
- 2026-07-29T10:16:44.390
- last_modified
- 2026-08-05T18:37:13.370
Related Entities (3)
HAS_WEAKNESS (1)
→[Weakness]Improper Verification of Cryptographic Signature
DESCRIBED_BY (1)
→[Source]NVD
AFFECTS_PRODUCT (1)
→[Product]
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