Apache Kyuubi up to 1.11.x Engine UI proxy server-side request forgery

Summaryinfo

A vulnerability classified as critical was found in Apache Kyuubi up to 1.11.x. The affected element is an unknown function of the component Engine UI proxy. Such manipulation leads to server-side request forgery. This vulnerability is traded as CVE-2026-23904. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Apache Kyuubi up to 1.11.x. Affected by this issue is an unknown function of the component Engine UI proxy. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Kyuubi Engine UI proxy accepts a host and port from the request path and proxies HTTP requests to that destination. A remote requester with network access to the proxy can cause the Kyuubi server to send HTTP requests to arbitrary reachable hosts, resulting in SSRF or open-proxy behavior. This issue affects Apache Kyuubi: from 1.8.0 before 1.12.0. Users are recommended to upgrade to version 1.12.0, which disables the proxy by default. To restore proxied Engine UI, set kyuubi.frontend.rest.engine.ui.proxy.enabled=true and configure allowed target hosts with kyuubi.frontend.rest.engine.ui.proxy.hosts.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-23904 since 01/19/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/29/2026).

Upgrading to version 1.12.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-50236). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Apache

Name

• Kyuubi

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11

License

• open-source

Website

• Vendor: https://www.apache.org/
• Product: https://github.com/apache/kyuubi/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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