# CVE-2026-108709: Apache Kylin authentication bypass in in-house network

Source: https://junglewise.ai/threats/cve-2026-108709-authentication-bypass-within-in-house-network-in-apache-kylin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-16. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-108709 · Severity: info · Published 2026-10-16

Apache Kylin is a big data analytics platform that provides query and analysis services. An authentication bypass vulnerability exists that could allow an attacker on an internal network to access Kylin services without proper credentials. The practical impact is limited to deployments that are directly exposed to the public internet, which is not a common configuration; most in-house Kylin installations are not affected.

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

## Quick answers

**Is CVE-2026-108709 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-108709 being exploited in the wild.

**How severe is CVE-2026-108709?** Informational severity, published 16 October 2026.

**Which products and versions are affected?** Apache Kylin 4.0.4 through 5.0.4.

**Is there a fix for CVE-2026-108709?** 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-2026-108709 attacked?** It is attacked from the adjacent network or over the network, in a hosted service.

**Am I affected by CVE-2026-108709?** 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

An authentication bypass flaw in Apache Kylin versions 4.0.4 through 5.0.4 allows attackers on the same network to circumvent authentication controls. The vulnerability requires network adjacency (in-house network access) and is most severe when Kylin services are exposed to the public internet. The fix is available in version 5.0.5.

## Affected products

- Apache Kylin 4.0.4 through 5.0.4

## Timeline

- 2026-10-16: disclosed

## References

- [https://lists.apache.org/thread.html/okkvcvoj1007f6cxhwp9v6j6t4ynfnwb](https://lists.apache.org/thread.html/okkvcvoj1007f6cxhwp9v6j6t4ynfnwb)

## Related threats

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- [Apache Kylin SQL injection in query processing](https://junglewise.ai/threats/cve-2026-108776-improper-neutralization-of-special-elements-used-in-an-sql)