CVE-2026-86466 Apache Airflow FAB provider - Authentication Bypass

Apache Airflow FAB provider contains an authentication bypass caused by missing validation of issuer and audience claims in the Authentik OAuth path, letting attackers with valid tokens for other applications authenticate as arbitrary users, exploit requires attacker to have a valid token for another application.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.37% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
16 September 2026
Updated
15 October 2026
Weakness
CWE-346

Vendor fix

Upgrade to version 3.9.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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