Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Fit2Cloud | Jumpserver | < 3.10.22 |
Related Weaknesses (CWE)
References
- https://github.com/jumpserver/jumpserver/pull/16608Issue Tracking
- https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wcPatchVendor Advisory
FAQ
What is CVE-2026-31864?
CVE-2026-31864 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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 upl...
How severe is CVE-2026-31864?
CVE-2026-31864 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31864?
Check the references section above for vendor advisories and patch information. Affected products include: Fit2Cloud Jumpserver.