CVE-2026-59243
Published:July 29, 2026
Updated:August 04, 2026
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 Packages
apache-airflow-providers-fab (CONDA):
Affected version(s) >=1.0.3 <3.7.3Fix Suggestion:
Update to version 3.7.3https://github.com/apache/airflow.git (GITHUB):
Affected version(s) >=providers-fab/1.0.0 <providers-fab/3.7.3Fix Suggestion:
Update to version providers-fab/3.7.3apache-airflow-providers-fab (PYTHON):
Affected version(s) >=1.0.0rc1 <3.7.3Fix Suggestion:
Update to version 3.7.3Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Verification of Cryptographic Signature
EPSS
Base Score:
0.53