kcp up to 0.26.2 improper authorization

Summaryinfo

A vulnerability has been found in kcp up to 0.26.2 and classified as critical. The impacted element is an unknown function. The manipulation leads to improper authorization. This vulnerability is uniquely identified as CVE-2025-29922. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in kcp up to 0.26.2. It has been rated as critical. This issue affects an unknown part. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

kcp is a Kubernetes-like control plane for form-factors and use-cases beyond Kubernetes and container workloads. Prior to 0.26.3, the identified vulnerability allows creating or deleting an object via the APIExport VirtualWorkspace in any arbitrary target workspace for pre-existing resources. By design, this should only be allowed when the workspace owner decides to give access to an API provider by creating an APIBinding. With this vulnerability, it is possible for an attacker to create and delete objects even if none of these requirements are satisfied, i.e. even if there is no APIBinding in that workspace at all or the workspace owner has created an APIBinding, but rejected a permission claim. A fix for this issue has been identified and has been published with kcp 0.26.3 and 0.27.0.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-29922 since 03/12/2025. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 0.26.3 eliminates this vulnerability. Applying the patch 614ecbf35f11db00f65391ab6fbb1547ca8b5d38 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Name

• kcp

Version

• 0.26.0
• 0.26.1
• 0.26.2

License

• open-source

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CPE 2.2info

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