CVE-2026-69080 in Kylin
Summary
by MITRE • 10/16/2026
Exposure of SQL Black List to an Unauthorized Actor vulnerability in Apache Kylin.
This issue affects Apache Kylin: from 4 through 5.0.4.
Users are recommended to upgrade to version 5.0.5, which fixes the issue.
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Analysis
by VulDB Data Team • 10/16/2026
The identified vulnerability in Apache Kylin represents a critical security flaw related to improper access control over sensitive configuration data. Specifically, this issue involves the exposure of an SQL blacklist mechanism to unauthorized actors within the application environment. In secure software architecture, blacklists are often employed as a defensive layer to filter out potentially malicious or invalid input patterns before they reach downstream components like database engines. By exposing these lists publicly or allowing unauthenticated access, Apache Kylin inadvertently reveals internal security logic and filtering rules that should remain opaque to external users. This exposure occurs in versions ranging from 4 through 5.0.4, indicating a systemic oversight in the design of the user interface or API endpoints responsible for managing query restrictions during this period.
From a technical perspective, the core flaw lies in the lack of proper authorization checks on the endpoint that serves SQL blacklist configurations. When an attacker gains access to these lists, they can analyze the specific patterns being blocked by the system. This knowledge allows them to craft input strings that bypass existing filters while still achieving malicious objectives such as SQL injection or data exfiltration. The vulnerability essentially turns a security control into reconnaissance material for potential attackers. By understanding exactly which keywords and syntax structures are prohibited, an adversary can modify their attack vectors to evade detection mechanisms built into the Kylin query engine. This undermines the integrity of the input validation process and reduces the effectiveness of existing defenses against common web application attacks.
The operational impact of this vulnerability is significant for organizations relying on Apache Kylin for large-scale data analytics. If exploited, an attacker could potentially execute arbitrary SQL commands within the context of the database user account associated with the Kylin service. This may lead to unauthorized access to sensitive business intelligence data, modification or deletion of critical datasets, and in severe cases, full compromise of the underlying infrastructure if privilege escalation is possible. Furthermore, the exposure itself constitutes a violation of confidentiality principles, as it reveals internal security policies that should be kept confidential to maintain defense-in-depth strategies. The risk is compounded by the fact that Kylin often interfaces with powerful data warehouses where access controls are already complex and potentially misconfigured.
To mitigate this vulnerability, organizations must immediately upgrade Apache Kylin to version 5.0.5 or later, which addresses the improper authorization checks on the SQL blacklist endpoints. Until an upgrade can be performed, administrators should implement network-level restrictions such as firewall rules or reverse proxy configurations to limit access to affected API endpoints exclusively to trusted internal networks and authenticated administrative users. Additionally, it is advisable to audit existing query logs for any signs of exploitation attempts that may have occurred while the vulnerability was present in production environments. Regular security assessments and penetration testing should be conducted to ensure that similar exposure flaws do not exist elsewhere in the application stack.
This issue aligns with CWE-200, which categorizes information exposure as a distinct class of vulnerabilities where sensitive system information is made available to unauthorized actors. It also relates to ATT&CK technique T1592, specifically Gather Victim Host Information, as attackers can use exposed configuration details to map out the security controls in place and refine their attack strategies accordingly. Adhering to secure coding standards that mandate strict access control checks on all administrative and diagnostic endpoints is essential for preventing similar issues in future software releases. Maintaining a robust patch management process ensures that such critical fixes are applied promptly, minimizing the window of exposure and protecting organizational data assets from potential compromise.