Apache Airflow Login Redirect Bypass Enables Phishing

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.

Casky was already ahead

This CVE exploits attack patterns that Casky's 301matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

CVE-2026-40961 is an open redirect vulnerability in Apache Airflow's login redirect mechanism that allows authenticated attackers to craft malicious URLs bypassing the `is_safe_url` validation check. By manipulating the redirect parameter, attackers can redirect users from a trusted Airflow domain to attacker-controlled sites, enabling credential harvesting and phishing attacks. This affects all Apache Airflow deployments prior to version 3.2.2, particularly those exposed to the internet or within networks where users might not scrutinize redirect destinations. The vulnerability is particularly dangerous because it leverages legitimate authentication flows and user trust in the Airflow domain to deliver social engineering payloads.

Casky's 301 mapped skills detect the attack patterns underlying this vulnerability by analyzing MITRE ATT&CK techniques TA0001 (Reconnaissance) and TA0043 (Reconnaissance) through Claude's extended reasoning. Practitioners using Casky would identify suspicious login redirect patterns including: crafted URL parameters attempting to bypass domain validation logic, authentication sequences followed by unexpected domain transitions, and user-agent patterns consistent with phishing reconnaissance. The platform's skill mapping reveals CWE-601 (URL Redirection to Untrusted Site) exploitation attempts by correlating HTTP referrer anomalies, repeated redirect parameter fuzzing, and post-authentication behavioral pivots to external domains. Security teams would see findings flagging inconsistent redirect destinations relative to organization whitelists, failed `is_safe_url` validations in logs, and reconnaissance activities probing the login endpoint's parameter handling—enabling detection before credential exfiltration occurs.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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301 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-40961.

analyzing-apt-group-with-mitre-navigator

threat intelligence · low

Run

analyzing-campaign-attribution-evidence

threat intelligence · low

Run

analyzing-certificate-transparency-for-phishing

threat intelligence · low

Run

MITRE ATT&CK Techniques

TA0001 TA0043

Investigate the attack patterns behind CVE-2026-40961

Casky has 301 skills that investigate the attack patterns behind CVE-2026-40961. Run one and get CVSS-scored findings in 3 minutes.

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