---
id: "CVE-2026-108709"
kind: "vulnerability"
aliases: ["CVE-2026-108709"]
title: "Authentication bypass within in-house network in Apache Kylin"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["apache-kylin", "data-platform", "package", "self-hosted"]
not_affected_if: ["in-house-only-network", "versions-outside-4.0.4-to-5.0.4"]
published_at: "2026-10-16T20:17:18+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-23T22:28:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-108709", "first_seen_at": "2026-10-23T21:57:14+00:00"}]
---

# Authentication bypass within in-house network in Apache Kylin

Apache Kylin versions 4.0.4 through 5.0.4 contain an authentication bypass that lets a remote attacker get past login on the Kylin service. The sources state the flaw is most dangerous when Kylin is directly exposed to the public internet, and that in-house deployments are mostly not affected.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Check the deployed Kylin version against 4.0.4 through 5.0.4
Check whether the Kylin service port is reachable from the public internet

## Fix

Upgrade Apache Kylin to version 5.0.5

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-108709

## From the sources

Authentication bypass within in-house network in Apache Kylin. Impact most to the kylin services that are directly exposed to public network, which is not common. In-house kylin deployments are mostly not impacted.



This issue affects Apache Kylin: from 4.0.4 through 5.0.4.



Users are recommended to upgrade to version 5.0.5, which fixes the issue.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_