Key points
- Apache Airflow Amazon provider versions prior to 9.38.0 are vulnerable to CVE-2026-86467.
- The flaw allows unauthenticated attackers to force victims into attacker-controlled accounts via SAML.
- Versions before 9.38.0 are affected; the source does not confirm a fix exists.
Apache Airflow Amazon provider versions before 9.38.0 contain a security flaw identified as CVE-2026-86467. This issue affects the AWS authentication manager within the software. The vulnerability allows an unauthenticated attacker to manipulate the login process. According to the official advisory, the problem stems from how SAML login responses are handled. Users who fall victim to this exploit are logged into an account controlled by the attacker rather than their own.
In plain English
The vulnerability exists because the login system does not properly link the authentication request to the specific browser session that started it. When a user attempts to log in using SAML, the system ignores a unique identifier called the AuthnRequest ID. The callback mechanism then validates the login assertion without requiring a matching InResponseTo value. This gap allows an attacker to intercept or redirect the login flow. Consequently, the system accepts a forged authentication response, effectively handing control of the session to the attacker.
The background
Jarek Potiuk posted the advisory on the oss-security mailing list on October 19. The listing assigns the flaw a moderate severity rating. The issue is specific to the Apache Airflow Amazon provider, which handles AWS-related integrations. The technical root cause is the lack of binding between the initial authentication request and the final response. This design oversight enables cross-site request forgery (CSRF) attacks against the login handler.
What changes now
Users running Apache Airflow with the Amazon provider should check if they are using versions before 9.38.0. The source material identifies these versions as affected. No vendor patch or security update has been confirmed in the provided advisory. Organizations should verify their current provider version immediately to determine if they are exposed. If a fix is released, it will likely address the missing binding of authentication responses.
Who needs to act first
Teams managing Airflow instances should prioritize updating systems exposed to untrusted networks or internet traffic. Before applying any future upgrade to production environments, administrators should test the new version in a staging area to ensure compatibility with existing workflows. It is prudent to back up configuration files and database states before initiating the update process. If immediate updating is not feasible, restrict access to the Airflow web interface using network-level controls until a patch is deployed.
Background: Cross-site request forgery (CSRF)
Cross-site request forgery tricks users into executing unwanted actions on trusted sites. Protect your business by enforcing same-site cookies and validating request origins. Verify that your web applications use anti-forgery tokens and restrict sensitive operations to secure contexts.
Read the full guide: CSRF Risks and Protection: Secure Your Business Web Apps
What to do and how to stay safe: Apache Airflow
- Verify the current version of the Apache Airflow Amazon provider on all servers and compare it against 9.38.0.
- Schedule an immediate deployment of the updated package to any instance accessible outside the internal network once available.
- Monitor authentication logs for unusual login patterns or unexpected account switches following any SAML login attempts.
- Review access controls to ensure only authorized personnel can initiate SAML authentication flows from public endpoints.
Step-by-step guide: Out-of-Band Patches: Meaning, Risks, and Deployment Reality
General security guidance from the Patch Herald newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
Which specific software is affected by this vulnerability?
The Apache Airflow Amazon provider versions before 9.38.0 are affected by CVE-2026-86467.
Is there a patch available to fix this issue?
The source material does not confirm that a patch or fix has been released yet.
What severity rating does this flaw have?
The official advisory rates CVE-2026-86467 as having moderate severity.
