# CVE-2026-108766: Apache Kylin missing authorization in JDBC source config update

Source: https://junglewise.ai/threats/cve-2026-108766-missing-authorization-on-jdbc-source-config-update-in-apache  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-19. Updated: 2026-10-19  
License: CC BY 4.0 with a link back

CVE-2026-108766 · Severity: info · Published 2026-10-19

Apache Kylin is an analytics engine used to query large datasets. A missing authorization check allows unauthenticated or unauthorized users to modify JDBC data source configurations, which could allow attackers to redirect database connections to malicious servers. This risk is primarily for Kylin deployments exposed directly to the public internet, which is uncommon; typical internal deployments face lower risk.

Technologies: [Apache Kylin](https://junglewise.ai/threats/technologies/kylin). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-108766 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-108766 being exploited in the wild.

**How severe is CVE-2026-108766?** Informational severity, published 19 October 2026.

**Which products and versions are affected?** Apache Kylin 4.0.0 through 5.0.4.

**Is there a fix for CVE-2026-108766?** Yes: fixed in 5.0.5. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-108766 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-108766?** Check whether you run Apache Kylin at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 5.0.5

## Technical details

The vulnerability is a missing authorization control on the JDBC source configuration update endpoint in Apache Kylin versions 4.0.0 through 5.0.4. An attacker with network access to the Kylin API can modify data source configurations without proper privilege checks, potentially redirecting queries to attacker-controlled databases. The fix is available in version 5.0.5.

## Affected products

- Apache Kylin 4.0.0 through 5.0.4

## References

- [https://lists.apache.org/thread.html/50447hzwyz8r9xwtfbylsphv4ylq9yhj](https://lists.apache.org/thread.html/50447hzwyz8r9xwtfbylsphv4ylq9yhj)

## Related threats

- [Apache Kylin resource exhaustion in cache API](https://junglewise.ai/threats/cve-2026-108837-allocation-of-resources-without-limits-or-throttling)
- [Apache Kylin default startup profile missing security settings](https://junglewise.ai/threats/cve-2026-108833-default-startup-profile-miss-security-settings-in-apache-kylin)
- [Apache Kylin information disclosure in job manipulation](https://junglewise.ai/threats/cve-2026-108823-exposure-of-sensitive-information-to-an-unauthorized-actor)
- [Apache Kylin JDBC source configuration validation vulnerability](https://junglewise.ai/threats/cve-2026-108780-potential-jdbc-source-configuration-validation-vulnerability-in)
- [Apache Kylin SQL injection in query processing](https://junglewise.ai/threats/cve-2026-108776-improper-neutralization-of-special-elements-used-in-an-sql)