CVE-2026-31864
JumpServer has a Server-Side Template Injection Leading to RCE via YAML Rendering
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.
INFO
Published Date :
March 13, 2026, 7:54 p.m.
Last Modified :
March 18, 2026, 1:09 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update JumpServer to the latest version.
- Apply vendor patches if available.
- Restrict upload permissions.
- Review audit logs for suspicious activity.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-31864.
| URL | Resource |
|---|---|
| https://github.com/jumpserver/jumpserver/pull/16608 | Issue Tracking |
| https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31864 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31864
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31864 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-31864 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 18, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:* versions up to (excluding) 3.10.22 *cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:* versions from (including) 4.0.0 up to (excluding) 4.10.16 Added Reference Type GitHub, Inc.: https://github.com/jumpserver/jumpserver/pull/16608 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc Types: Patch, Vendor Advisory -
New CVE Received by [email protected]
Mar. 13, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H Added CWE CWE-1336 Added Reference https://github.com/jumpserver/jumpserver/pull/16608 Added Reference https://github.com/jumpserver/jumpserver/security/advisories/GHSA-qx8h-rx2j-j5wc