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CVE-2026-31864

JumpServer has a Server-Side Template Injection Leading to RCE via YAML Rendering

Published: Mar 13, 2026Updated: Mar 18, 2026 Sources: CVE List NVDCWE-1336
NVD MITRE
6.8CVSSMEDIUM
EPSS Score
0.3%
Top 73.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:RS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-1336

Affected Products

jumpserverfit2cloud
SaaSWeb App
Cloud & SaaS
jumpserverjumpserver
Mixed
Security Products / identity-access-mgmt
fit2cloudcommercialCloud & SaaSaka jumpserver, 1panel, cloudexplorer lite
jumpserveross-projectSecurity Productsaka jumpserver.org, jumpserver

Exploitability

Official Patch Available

References

https://github.com/jumpserver/jumpserver/pull/16608
github.com
https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc
github.com

Timeline

Published
Mar 13, 2026
Last Updated
Mar 18, 2026

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