External risk intelligence

Apache Airflow FAB Provider Password Reset Flaw Allows Session Hijacking.

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-86462

Apache Airflow is commonly deployed as a web-based platform for managing and orchestrating workflows. The vulnerable component, the FAB (Flask-AppBuilder) provider, powers the web interface used by administrators and users. Because this interface is frequently exposed to facilitate remote workflow management, it is a commonly internet-reachable web service.

Apache Airflow Providers Fab

3.2.0 to before 3.9.0

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A security vulnerability has been identified in Apache Airflow's FAB provider that affects user session management. When a user's password is changed, existing sessions are not properly invalidated, meaning an attacker who has already compromised a user's session cookie can maintain access even after the password reset. This issue impacts deployments using the FAB authentication manager with database-backed sessions and requires an upgrade to resolve, even for those who have addressed a related vulnerability.

Passwords changed, but old access persists.
Session access remains after password reset.
Confirm if your Airflow is affected.

Attack Path

How an attacker could exploit the issue

An attacker with a victim's session cookie can maintain access even after the victim changes their password. This occurs because the system fails to invalidate existing sessions when a password reset is performed through the user-edit endpoint, allowing the attacker to continue impersonating the user.

Attacker possesses victim's session cookie.
User changes password via admin endpoint.
Session remains active, granting continued access.

Live Threat

Current exploitation, exposure, and threat context

When a user's password is changed in Apache Airflow deployments using the FAB auth manager with database-backed sessions, existing session cookies are not invalidated. This means an attacker possessing a valid session cookie can maintain access to the user's account even after a password reset.

User sessions remain active after password changes.
Session cookies grant continued unauthorized access.
Attackers may retain access to user accounts.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in Apache Airflow's FAB provider affects deployments using database-backed sessions, where changing a user's password does not invalidate existing session cookies. The first practical move is to identify all instances of the affected technology, confirm their reachability and criticality, then pinpoint the accountable owner and plan remediation.

Platform or application owners should own the issue.
Verify affected Airflow instances and session management.
Coordinate upgrade during the next maintenance window.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is the Apache Airflow FAB provider?

The FAB provider stands for Flask-AppBuilder; it is a critical component within Apache Airflow that powers the platform's web interface. Users and administrators rely on this interface to manage complex data workflows, monitor job statuses, and handle user authentication, making it the primary gateway for interacting with the orchestration environment.

What does CWE-613 mean for CVE-2026-86462?

CWE-613 classifies this as an Insufficient Session Expiration issue. In the context of this CVE, it means the system fails to force a logout or invalidate existing session tokens when a security-sensitive event, such as a password change, occurs. Because the session remains valid in the database, the old cookie continues to act as a 'skeleton key' even after the account credentials have been updated.

How is this vulnerability triggered?

The vulnerability is triggered simply by changing a user's password through the Admin user-edit PATCH endpoint. It does not require an attacker to interact with the endpoint themselves or perform any specific exploit action. Notably, if your deployment does not use the FAB auth manager with database-backed sessions, this specific session-retention behavior does not apply.

Do I need to worry if my Airflow instance is internal?

Halo Surface Signal indicates that the FAB provider interface is a commonly internet-reachable web service. While internal instances face a lower risk of initial session theft, any environment where users access the platform remotely or where internal accounts are shared can be affected. You should assess the exposure of your specific deployment to determine if it is reachable beyond your trusted network.

When should I take action for CVE-2026-86462?

You should prioritize upgrading to apache-airflow-providers-fab version 3.9.0 or later during your next maintenance window. Note that if you previously applied a fix for CVE-2026-82311, you must still perform this upgrade, as the previous patch did not cover this specific endpoint. Coordinate with your platform owners to verify your current version and schedule the necessary update to ensure session invalidation works correctly.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.