JumpServer up to 3.10.17/4.7.x Kubernetes Session privileges assignment

Summaryinfo

A vulnerability, which was classified as problematic, has been found in JumpServer up to 3.10.17/4.7.x. Affected is an unknown function of the component Kubernetes Session Handler. This manipulation causes privileges assignment. This vulnerability is handled as CVE-2025-27095. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in JumpServer up to 3.10.17/4.7.x. It has been declared as problematic. Affected by this vulnerability is an unknown functionality of the component Kubernetes Session Handler. The manipulation with an unknown input leads to a privileges assignment vulnerability. The CWE definition for the vulnerability is CWE-266. A product incorrectly assigns a privilege to a particular actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality. The summary by CVE is:

JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to 4.8.0 and 3.10.18, an attacker with a low-privileged account can access the Kubernetes session feature and manipulate the kubeconfig file to redirect API requests to an external server controlled by the attacker. This allows the attacker to intercept and capture the Kubernetes cluster token. This can potentially allow unauthorized access to the cluster and compromise its security. This vulnerability is fixed in 4.8.0 and 3.10.18.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-27095 since 02/18/2025. The exploitation appears to be easy. The attack can be launched remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 3.10.18 or 4.8.0 eliminates this vulnerability.

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Productinfo

Name

• JumpServer

Version

• 3.10.0
• 3.10.1
• 3.10.2
• 3.10.3
• 3.10.4
• 3.10.5
• 3.10.6
• 3.10.7
• 3.10.8
• 3.10.9
• 3.10.10
• 3.10.11
• 3.10.12
• 3.10.13
• 3.10.14
• 3.10.15
• 3.10.16
• 3.10.17
• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7

Website

• Product: https://github.com/jumpserver/jumpserver/

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