6.8

CVE-2026-31864

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

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Fit2cloud ≫ Jumpserver Version < 3.10.22
Fit2cloud ≫ Jumpserver Version >= 4.0.0 < 4.10.16
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.35% 0.264
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security-advisories@github.com 6.8 0.9 5.9
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine

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.

https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc
Patch
Vendor Advisory
https://github.com/jumpserver/jumpserver/pull/16608
Issue Tracking