Is CVE-2026-31864 actively exploited?

CVE-2026-31864 has no public evidence of in-the-wild exploitation as of 2026-03-18.

What is the CVSS score for CVE-2026-31864?

CVE-2026-31864 has a CVSS score of 6.8 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

How do I patch CVE-2026-31864?

Patch guidance is available from fit2cloud security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-31864.

CVE-2026-31864 - remediation guidance & executive summary

Q: Which products are affected by CVE-2026-31864?

2 products: fit2cloud jumpserver, fit2cloud jumpserver.

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: high
User Action: required
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-1336

Metadata

Primary Vendor: FIT2CLOUD
Published: 3/13/2026
Last Modified: 3/18/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

fit2cloud : jumpserverfit2cloud : jumpserver

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-31864. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-31864

View on NIST NVD

CVE-2026-31864 vulnerability