# CVE-2026-108771: Apache Kylin missing authentication and polymorphic deserialization

Source: https://junglewise.ai/threats/cve-2026-108771-missing-authentication-for-in-house-broadcast-and-polymorphic  
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-2026-108771 · Severity: info · Published 2026-10-19

Apache Kylin is an analytics platform used to query and analyze large datasets. This vulnerability allows an attacker to bypass authentication and exploit unsafe deserialization of data, potentially leading to unauthorized access or code execution. The risk is highest for Kylin deployments exposed directly to the public internet, which is uncommon; internal deployments are at lower risk.

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

## Quick answers

**Is CVE-2026-108771 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-108771 being exploited in the wild.

**How severe is CVE-2026-108771?** 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-2026-108771?** 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-2026-108771 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-108771?** 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 involves missing authentication checks on in-house broadcast functionality combined with polymorphic deserialization, which can be exploited by an unauthenticated network attacker to compromise the Kylin service. The attack requires the service to be exposed to the attacker's network. A fix is available in version 5.0.5.

## Affected products

- Apache Kylin 4.0.0 through 5.0.4

## Timeline

- 2026-10-19: disclosed

## References

- [https://lists.apache.org/thread.html/d77s7dh3bxf02l4rjbgb6807g605zskx](https://lists.apache.org/thread.html/d77s7dh3bxf02l4rjbgb6807g605zskx)

## Related threats

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- [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)