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

Status: published. Published: 2026-06-01. Updated: 2026-11-03.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: apache) — https://github.com/apache/airflow/pull/65557

## Affected products and versions

- Apache Software Foundation / Apache Airflow (apache-airflow-core): ≥ 3.0.0; < 3.2.2 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CVSS 3.1: 7.2 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 0.65% as of 2026-11-02; percentile 51.10%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-601

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/apache/airflow/pull/65557 (CNA: apache; patch)

- https://lists.apache.org/thread/qmt8ksh7gty6b8hr9w294t94j36jdv1q (CNA: apache; vendor-advisory)

- http://www.openwall.com/lists/oss-security/2026/05/31/2 (ADP: CVE)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-40961; retrieved 2026-11-03; source updated 2026-11-03

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-40961; retrieved 2026-11-03; source updated Not reported

Revision: bb66a4441176dd5bff76d679b7891bca306b5519e9568ffeb3de79a23266293f

Canonical: https://y2.dev/cve/CVE-2026-40961

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