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TI-2026-42383 Aliases CVE-2026-59243GHSA-q5r3-w69r-hrfw

Improper signature verification in Apache Airflow FAB provider

Priority MEDIUM 50CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-347.

Summary

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`.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00643 51st percentileScored 2026-11-07
Fix Fixed Apache Airflow FAB provider (Apache Software Foundation): 3.7.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Airflow FAB providerbefore 3.7.33.7.3Patch availableCNA
  • Apache Airflow FAB provider VendorApache Affected before 3.7.3 Fixed in 3.7.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:*before 3.7.3VulnerableApache
  • cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:* Versions before 3.7.3 Vulnerable ·Apache

Remediation

  • Fix · CNA Apache Airflow FAB provider (Apache Software Foundation) Fixed in 3.7.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59243
  2. 2026-10-03 Alias added: GHSA-q5r3-w69r-hrfw
  3. 2026-10-21 EPSS moved to the 50th–90th percentile

References

Patch 1

Advisory 2

  • TI-2026-56769 Insufficient session expiration in Apache Airflow FAB provider CVSS 3.1CRITICAL 9.8
  • TI-2024-28416 Apache Airflow Providers FAB: FAB provider 1.2.1 and 1.2.0 did not let user to logout for Airflow CVSS 3.1CRITICAL 9.8
  • TI-2026-59161 Apache Airflow FAB provider: FAB Admin password PATCH does not invalidate database-backed sessions CVSS 3.1CRITICAL 9.1
  • TI-2026-52804 Origin validation error in Apache Airflow FAB provider CVSS 3.1CRITICAL 9.1
  • TI-2024-30146 Apache Airflow Fab Provider: Application does not invalidate session after password change via Airflow cli CVSS 3.1HIGH 8.1
  • TI-2026-42385 Improper privilege management in Apache Airflow FAB provider CVSS 3.1HIGH 8.1
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences