JumpServer up to 4.10.16 Applet Host Deployment special elements in template engine

Summaryinfo

A vulnerability, which was classified as problematic, was found in JumpServer up to 4.10.16. Affected is an unknown function of the component Applet Host Deployment. Executing a manipulation can lead to special elements in template engine. This vulnerability is handled as CVE-2026-44845. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in JumpServer up to 4.10.16. This vulnerability affects some unknown functionality of the component Applet Host Deployment. The manipulation with an unknown input leads to a special elements in template engine vulnerability. The CWE definition for the vulnerability is CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

JumpServer is an open source bastion host and an operation and maintenance security audit system. Prior to 4.10.17, an authenticated administrator with Applet Host management and deployment permissions can inject Jinja2 expressions into the IP/Host field or Core Service Address field, causing Ansible to evaluate ansible_host inventory data or playbook variables during Applet Host deployment and execute arbitrary commands on the JumpServer control node. This issue is fixed in version 4.10.17.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-44845 since 05/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. The exploitation needs additional levels of successful authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1221.

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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