Improper Authorization in Apache Kylin Job Retrieval

Executive Summary

CVE-2026-62393 is an improper authorization vulnerability in Apache Kylin. It affects versions 4 through 5.0.3. The issue arises from improper handling of permissions during job information retrieval, allowing attackers to access unauthorized jobs in other projects.

This means that an attacker could exploit this flaw to view or interact with job data that they should not have access to, potentially exposing sensitive information or disrupting operations.

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Impact Analysis

If you are using an affected version of Apache Kylin (4 through 5.0.3), this vulnerability could impact you in the following ways:

• Unauthorized access to job information: Attackers may gain access to jobs in projects they are not authorized to view, leading to potential data leaks.
• Exposure of sensitive data: If job information contains confidential or regulated data, this vulnerability could result in unauthorized disclosure.
• Operational disruptions: Attackers might manipulate or disrupt jobs, affecting business processes that rely on Apache Kylin.

To mitigate these risks, it is recommended to upgrade to Apache Kylin version 5.0.4 or later.

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Compliance Impact

This vulnerability could affect compliance with common standards and regulations in the following ways:

• GDPR (General Data Protection Regulation): If unauthorized access to job information results in the exposure of personal data of EU citizens, it could violate GDPR requirements for data protection and breach notification.
• HIPAA (Health Insurance Portability and Accountability Act): If job information includes protected health information (PHI), unauthorized access could lead to non-compliance with HIPAA's privacy and security rules.
• Other industry-specific regulations: Depending on the nature of the data processed by Apache Kylin, this vulnerability could also impact compliance with other standards such as PCI DSS (for payment data) or SOX (for financial data).

Organizations should assess whether the exposed job information includes regulated data and take corrective actions, such as upgrading to a patched version, to maintain compliance.

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Detection Guidance

Detecting this vulnerability requires checking if your Apache Kylin instance is running a vulnerable version (4 through 5.0.3). You can verify the installed version by accessing the Kylin web interface or checking the version information in the configuration files or logs.

• Check the Kylin version via the web UI: Navigate to the 'About' or 'System' section in the Kylin dashboard to find the version number.
• Check the Kylin logs: Look for version details in the startup logs or configuration files, typically located in the Kylin installation directory (e.g., /opt/kylin/logs/kylin.log).
• Use command-line tools: If you have access to the server, run the following command to check the Kylin version: 'kylin.sh version' or inspect the version in the Kylin JAR files (e.g., 'ls -l /opt/kylin/lib/kylin-*.jar').

Additionally, monitor network traffic or logs for unusual access patterns to job information, particularly requests to endpoints that retrieve job details across different projects. However, the primary detection method is confirming the installed version.

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Mitigation Strategies

The most effective mitigation is to upgrade Apache Kylin to version 5.0.4 or later, as this version fixes the improper authorization issue.

• Upgrade Apache Kylin: Follow the official Apache Kylin upgrade guide to migrate from your current version (4 through 5.0.3) to version 5.0.4 or later. Ensure you back up configurations and data before upgrading.
• Restrict access to Kylin: If upgrading is not immediately possible, limit access to the Kylin web interface and APIs to trusted users or IP addresses using network-level controls (e.g., firewalls, VPNs).
• Monitor for suspicious activity: Enable detailed logging for job information retrieval requests and review logs for unauthorized access attempts. Set up alerts for unusual patterns.
• Review user permissions: Ensure that user roles and permissions are correctly configured to prevent unauthorized access to job information across projects. Remove unnecessary privileges from user accounts.

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