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  4. CVE 2026 86466 apache airflow fab provider fab authentik
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Back to active CVEs
High · CVSS 8.1CVE-2026-86466

Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validatedCVE-2026-86466

Answer in brief

CVE-2026-86466 records a High severity (CVSS 8.1) vulnerability in Apache Airflow FAB provider: FAB Authentik provider: id_token issuer/audience not validated. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache Airflow FAB provider (generic), Apache Software Foundation/apache-airflow-providers-fab (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 18, 2026Source checked Oct 31, 2026First seen by HOL Sep 16, 2026Material review Sep 18, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.1
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache Airflow FAB provider (generic), Apache Software Foundation/apache-airflow-providers-fab (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:apache:apache-airflow-providers-fab:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache Airflow FAB providergeneric>=0 <3.9.03.9.0
Apache Software Foundation/apache-airflow-providers-fabgeneric>=0 <3.9.03.9.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache Airflow FAB provider, Apache Software Foundation/apache-airflow-providers-fab.
  2. 2Review the reported fix. Update Apache Software Foundation/Apache Airflow FAB provider to 3.9.0; Apache Software Foundation/apache-airflow-providers-fab to 3.9.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 16, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 16, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencelists.apache.org
  • Source referencelists.apache.org
  • Source referencecve.org
Upstream source description

Apache Airflow FAB provider: the Authentik OAuth path in the FAB auth manager does not validate the issuer or audience claims of the id_token it accepts. An attacker holding a token that the same Authentik identity provider minted for a different client application can present it to Airflow and be authenticated as the user it names, because the audience claim is never checked. Affects deployments using the FAB auth manager with Authentik OAuth where the same Authentik instance also serves other applications; the attacker needs a valid token for any of those other applications, not for Airflow. CVE-2026-75156 corrected the same missing validation on the Azure AD path in this file; the Authentik path was left unchanged and is fixed here. Deployments that applied the CVE-2026-75156 fix and use Authentik must also upgrade for this one. Users of apache-airflow-providers-fab are recommended to upgrade to version 3.9.0 or later, which fixes the issue.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-346
Source
CVE List V5
Source checked
Oct 31, 2026
References
4 linked sources
Open source record