Vulnerability · Published Mar 13, 2026 · Assigned by GitHub_M
CVE-2026-31864JumpServer has a Server-Side Template Injection Leading to RCE via YAML Rendering
Medium 6.8
In plain English
A medium-severity security flaw in jumpserver from jumpserver. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| jumpserver | jumpserver | < 3.10.22>= 4.0.0, < 4.10.16 |
Weakness: CWE-1336 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
References
- https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc x_refsource_CONFIRM
- https://github.com/jumpserver/jumpserver/pull/16608 x_refsource_MISC