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CVE-2026-31864 Details

Description

JumpServer is an open source bastion host and an operation and maintenance security audit system. a Server-Side Template Injection (SSTI) vulnerability exists in JumpServer's Applet and VirtualApp upload functionality. This vulnerability can only be exploited by users with administrative privileges (Application Applet Management or Virtual Application Management permissions). Attackers can exploit this vulnerability to execute arbitrary code within the JumpServer Core container. The vulnerability arises from unsafe use of Jinja2 template rendering when processing user-uploaded YAML configuration files. When a user uploads an Applet or VirtualApp ZIP package, the manifest.yml file is rendered through Jinja2 without sandbox restrictions, allowing template injection attacks.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:6.8 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/jumpserver/jumpserver/pull/16608	[email protected]	Issue Tracking
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc	[email protected]	PatchVendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-1336	Improper Neutralization of Special Elements Used in a Template Engine	[email protected]

Affected Products

Product	Versions
fit2cloud jumpserver	< 3.10.22 >= 4.0.0, < 4.10.16
CPE cpe:2.3:a:fit2cloud:jumpserver:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Jun 17, 2026	CVE Modified	CISA-ADP
Mar 18, 2026	Initial Analysis	[email protected]
Mar 13, 2026	New CVE Received	[email protected]