JumpServer up to 4.10.16 Ansible-based Automation Rendering code injection

Summaryinfo

A vulnerability classified as critical has been found in JumpServer up to 4.10.16. This affects an unknown part of the component Ansible-based Automation Rendering. The manipulation leads to code injection. This vulnerability is referenced as CVE-2026-104126. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in JumpServer up to 4.10.16. It has been rated as critical. This issue affects some unknown processing of the component Ansible-based Automation Rendering. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to 4.10.17-lts, JumpServer's Ansible-based automation rendering can evaluate attacker-controlled template expressions from users who have permission to create or execute affected automation tasks. Crafted content can invoke sensitive Ansible lookup behavior, including file, pipe, env, and password lookups, within the Ansible execution context, which can disclose files or environment values and may permit limited command execution under the privileges of the automation process. The issue does not provide unauthenticated access or direct access to unrelated JumpServer assets. This issue is fixed in version 4.10.17-lts.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-104126 since 10/01/2026. 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 T1059 according to MITRE ATT&CK.

Upgrading to version 4.10.17 eliminates this vulnerability.

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Productinfo

Name

• JumpServer

Version

• 4.10.0
• 4.10.1
• 4.10.2
• 4.10.3
• 4.10.4
• 4.10.5
• 4.10.6
• 4.10.7
• 4.10.8
• 4.10.9
• 4.10.10
• 4.10.11
• 4.10.12
• 4.10.13
• 4.10.14
• 4.10.15
• 4.10.16

Website

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

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