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CVE-2026-40961: Apache Airflow: Open Redirect Bypass Vulnerability

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-21
• Weakness: CWE-601

Description

A bug in the login redirect route in Apache Airflow allowed authenticated users to craft URLs that bypassed the `is_safe_url` check, enabling redirection from a trusted Airflow domain to an attacker-controlled origin. Users are advised to upgrade to `apache-airflow` 3.2.2 or later. As a defense-in-depth mitigation, deployment operators can place Airflow behind a reverse proxy that strips off-domain `next=` query parameters before they reach the login endpoint.

Affected products

• Apache Airflow: from 3.0.0 before 3.2.2 — fixed in 3.2.2

How to fix

Upgrade to a fixed version: Apache Airflow 3.2.2. Check the vendor advisory for mitigations.

References

• https://github.com/apache/airflow/pull/65557
• https://lists.apache.org/thread/qmt8ksh7gty6b8hr9w294t94j36jdv1q
• http://www.openwall.com/lists/oss-security/2026/05/31/2

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