CVE-2026-63618 in Kylin
Summary
by MITRE • 10/16/2026
Exposure of Sensitive Information (system level configuration info) 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 represents a critical failure in access control mechanisms within Apache Kylin versions ranging from 4.x up to and including 5.0.4. This flaw allows unauthorized actors to retrieve sensitive system-level configuration information that should be restricted to authenticated administrators or internal processes only. In the context of enterprise data warehousing, such as what Apache Kylin provides for OLAP analytics, configuration files often contain database connection strings, credentials, network endpoints, and security parameters. The exposure of these details constitutes a significant breach of confidentiality, undermining the integrity of the entire analytical infrastructure by providing attackers with the roadmap needed to launch more sophisticated attacks against backend data stores or internal networks.
From a technical perspective, this vulnerability aligns closely with CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The root cause typically involves improper validation of user privileges when accessing specific API endpoints or administrative interfaces within the Kylin web UI or REST APIs. Instead of enforcing strict role-based access control checks before returning configuration data, the application may inadvertently expose these details to users with lower privilege levels or even unauthenticated requests depending on the specific vector exploited. This misconfiguration allows an attacker who has gained any level of foothold in the system, whether through a compromised user account or via network-level interception if transport security is also weak, to extract sensitive metadata that aids in further reconnaissance and exploitation efforts.
The operational impact of this vulnerability extends beyond simple data leakage. By obtaining detailed configuration information, an adversary can identify the underlying database technologies used by Kylin, such as HBase, Hive, or MySQL, along with their specific versions and network locations. This intelligence facilitates targeted attacks against these backend systems using known exploits for those specific software versions. Furthermore, if credentials are embedded in plain text within exposed configurations, attackers may gain direct access to the data warehouse itself, leading to potential data exfiltration, manipulation of analytical results, or complete denial of service by disrupting critical business intelligence operations. The trust model of Apache Kylin relies heavily on its ability to securely aggregate and present data; compromising this foundation erodes confidence in all downstream reporting and decision-making processes that depend on the platform's accuracy and security.
Mitigation strategies must prioritize immediate remediation through software updates as well as defensive architectural adjustments. Users running affected versions are strongly advised to upgrade immediately to Apache Kylin version 5.0.5 or later, where this access control flaw has been resolved by implementing stricter permission checks for configuration-related endpoints. In addition to upgrading, organizations should audit their deployment configurations to ensure that sensitive information is not hardcoded in accessible locations and that all administrative interfaces are protected behind robust authentication gateways such as OAuth2 or Kerberos integration. Network segmentation should also be enforced to limit access to Kylin management ports from untrusted networks, reducing the attack surface available to potential adversaries attempting to exploit this exposure of system-level details.