Improper Neutralization of Special Elements Used in a Template Engine in JumpServer - CVE-2026-31864
Published: April 27, 2026
Vulnerability identifier: #VU128141
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31864
CWE-ID: CWE-1336
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: JumpServer
Affected software:
JumpServer
JumpServer
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to server-side template injection in yaml_load_with_i18n() in apps/common/utils/yml.py when processing user-uploaded YAML configuration files from Applet or VirtualApp ZIP packages. A remote privileged user can upload a specially crafted ZIP package containing a malicious manifest.yml file to execute arbitrary code.
User interaction is required for the upload and processing of an Applet or VirtualApp package.
How to mitigate CVE-2026-31864
Install security update from vendor's website.