CVE-2026-30911 is a security vulnerability identified in Apache Airflow versions 3.1.0 through 3.1.7, specifically involving missing authorization controls in the Execution API's Human-in-the-Loop (HITL) endpoints. Apache Airflow is a widely used open-source platform for programmatically authoring, scheduling, and monitoring workflows. The HITL feature allows human intervention in automated workflows, typically requiring strict authorization to ensure only permitted task instances can interact with their respective HITL workflows. However, this vulnerability (classified under CWE-862: Missing Authorization) permits any authenticated task instance to bypass these controls and read, approve, or reject HITL workflows belonging to other task instances. This unauthorized access undermines the confidentiality and integrity of workflow operations, potentially allowing attackers or malicious insiders to manipulate workflow outcomes or gain insight into sensitive process data. The flaw does not require elevated privileges beyond task instance authentication, making exploitation feasible within environments where multiple task instances operate. Although no public exploits have been reported, the vulnerability poses a significant risk due to the critical role Airflow plays in orchestrating complex workflows in various industries. The Apache Software Foundation has addressed this issue in Apache Airflow version 3.1.8, and users are advised to upgrade promptly to mitigate the risk.

The impact of CVE-2026-30911 is substantial for organizations using Apache Airflow for workflow orchestration, especially those relying on HITL workflows for critical business processes. Unauthorized access to HITL endpoints can lead to unauthorized disclosure of workflow data, manipulation of workflow approvals, and disruption of automated processes. This can result in incorrect or malicious workflow execution, potentially causing operational downtime, data integrity issues, and compliance violations. Attackers exploiting this vulnerability could interfere with decision points in workflows, leading to fraudulent approvals or denials, which may have cascading effects on business operations. The vulnerability affects the confidentiality, integrity, and availability of workflow management. Given Apache Airflow's adoption in sectors such as finance, healthcare, technology, and manufacturing, the threat could have wide-reaching consequences if exploited. The ease of exploitation by any authenticated task instance increases the risk, particularly in multi-tenant or shared environments where task instances may be controlled by different users or teams.

To mitigate CVE-2026-30911, organizations should immediately upgrade Apache Airflow to version 3.1.8 or later, where the missing authorization checks have been properly implemented. Until the upgrade is applied, administrators should restrict access to the Execution API and HITL endpoints to trusted users and task instances only, employing network segmentation and strict access controls. Implementing robust authentication and authorization mechanisms at the infrastructure level can help reduce exposure. Monitoring and logging access to HITL endpoints should be enhanced to detect any unauthorized attempts to read or modify workflows. Additionally, organizations should review and audit existing HITL workflows for suspicious activity or unauthorized changes. Employing role-based access control (RBAC) policies within Airflow and limiting task instance permissions can further reduce the attack surface. Regular security assessments and vulnerability scanning of Airflow deployments are recommended to identify and remediate similar issues proactively.